CISA KEV High
Denial of service
CVE-2023-44487 — HTTP/2 Rapid Reset Attack Vulnerability
The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.
73
Urgent
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- Confirmed exploitation (CISA KEV)+35
- Public exploit/PoC (exploitdb, github)+14
- EPSS 100% (30-day exploitation probability)+15
- Technical severity (high)+6
- Automatable exploitation (SSVC)+3
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
Exploitation
Confirmed
CISA KEV, listed Oct 10, 2023
EPSS FIRST
100%
ahead of 100% of scored CVEs · Oct 15, 2026
Affects
Akka
Http Server and 162 more
CVSS base
7.5
High · 4 source(s)
CISA SSVC assessment CISA
Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.
Exploitation
Active
none · proof-of-concept · active
Automatable
Yes
can an attacker script the kill-chain steps
Technical impact
Partial
partial · total control of the vulnerable component
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
- Documented patch — cgit.freebsd.org (NIST National Vulnerability Database)
- Documented patch — gist.github.com (NIST National Vulnerability Database)
- Documented patch — github.com (NIST National Vulnerability Database)
- Documented patch — github.com (NIST National Vulnerability Database)
- Documented patch — github.com (NIST National Vulnerability Database)
- Documented mitigation — github.com (NIST National Vulnerability Database)
- Documented patch — github.com (NIST National Vulnerability Database)
- Documented patch — github.com (NIST National Vulnerability Database)
- Documented patch — github.com (NIST National Vulnerability Database)
- Documented patch — github.com (NIST National Vulnerability Database)
- Documented patch — github.com (NIST National Vulnerability Database)
- Documented patch — github.com (NIST National Vulnerability Database)
- Documented patch — github.com (NIST National Vulnerability Database)
- Documented patch — github.com (NIST National Vulnerability Database)
- Documented patch — github.com (NIST National Vulnerability Database)
- Documented patch — github.com (NIST National Vulnerability Database)
- Documented patch — github.com (NIST National Vulnerability Database)
- Documented patch — github.com (NIST National Vulnerability Database)
- Documented patch — github.com (NIST National Vulnerability Database)
- Documented patch — github.com (NIST National Vulnerability Database)
- Documented patch — mailman.nginx.org (NIST National Vulnerability Database)
- Documented patch — msrc.microsoft.com (NIST National Vulnerability Database)
- Documented patch — msrc.microsoft.com (NIST National Vulnerability Database)
- Documented mitigation — www.nginx.com (NIST National Vulnerability Database)
- Maven Org.apache.tomcat.embed:tomcat-embed-core: fixed in version 11.0.0-M12 — github.com (GitHub Security Advisories)
- Maven Org.apache.tomcat.embed:tomcat-embed-core: fixed in version 10.1.14 — github.com (GitHub Security Advisories)
- Maven Org.apache.tomcat.embed:tomcat-embed-core: fixed in version 9.0.81 — github.com (GitHub Security Advisories)
- Maven Org.apache.tomcat.embed:tomcat-embed-core: fixed in version 8.5.94 — github.com (GitHub Security Advisories)
- Go Golang.org/x/net: fixed in version 0.17.0 — github.com (GitHub Security Advisories)
- Swift Github.com/apple/swift-nio-http2: fixed in version 1.28.0 — github.com (GitHub Security Advisories)
- Maven Org.eclipse.jetty.http2:http2-common: fixed in version 9.4.53 — github.com (GitHub Security Advisories)
- Maven Org.eclipse.jetty.http2:http2-common: fixed in version 10.0.17 — github.com (GitHub Security Advisories)
- Maven Org.eclipse.jetty.http2:http2-common: fixed in version 11.0.17 — github.com (GitHub Security Advisories)
- Maven Org.eclipse.jetty.http2:http2-server: fixed in version 9.4.53 — github.com (GitHub Security Advisories)
- Maven Org.eclipse.jetty.http2:http2-server: fixed in version 10.0.17 — github.com (GitHub Security Advisories)
- Maven Org.eclipse.jetty.http2:http2-server: fixed in version 11.0.17 — github.com (GitHub Security Advisories)
- Maven Org.eclipse.jetty.http2:jetty-http2-common: fixed in version 12.0.2 — github.com (GitHub Security Advisories)
- Maven Org.eclipse.jetty.http2:jetty-http2-server: fixed in version 12.0.2 — github.com (GitHub Security Advisories)
- Maven Com.typesafe.akka:akka-http-core: fixed in version 10.5.3 — github.com (GitHub Security Advisories)
- Maven Com.typesafe.akka:akka-http-core 2.13: fixed in version 10.5.3 — github.com (GitHub Security Advisories)
- Maven Com.typesafe.akka:akka-http-core 2.12: fixed in version 10.5.3 — github.com (GitHub Security Advisories)
- Maven Org.apache.tomcat:tomcat-coyote: fixed in version 11.0.0-M12 — github.com (GitHub Security Advisories)
- Maven Org.apache.tomcat:tomcat-coyote: fixed in version 10.1.14 — github.com (GitHub Security Advisories)
- Maven Org.apache.tomcat:tomcat-coyote: fixed in version 9.0.81 — github.com (GitHub Security Advisories)
- Maven Org.apache.tomcat:tomcat-coyote: fixed in version 8.5.94 — github.com (GitHub Security Advisories)
CISA required action CISA
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
US federal deadline: Oct 31, 2023 — passed 1081 day(s) ago
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Akka Http Server, Amazon Opensearch Data Prepper, Apache Software Foundation Apisix…).
- Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
- The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
- Apply the fixed version or the patch documented under Remediation.
- EPSS ahead of 100% of scored CVEs: prioritize it in the patch queue.
- Search available logs for exploit probes matching the vulnerability class (denial of service), errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Akka | Http Server | < 10.5.3 | Vulnerable | NIST National Vulnerability Database |
| Amazon | Opensearch Data Prepper | < 2.5.0 | Vulnerable | NIST National Vulnerability Database |
| Apache Software Foundation | Apisix | < 3.6.1 | Vulnerable | NIST National Vulnerability Database |
| Apache Software Foundation | Solr | < 9.4.0 | Vulnerable | NIST National Vulnerability Database |
| Apache Software Foundation | Tomcat |
≥ 8.5.0 and ≤ 8.5.93≥ 9.0.0 and ≤ 9.0.80≥ 10.1.0 and ≤ 10.1.13version 11.0.0-milestone1version 11.0.0-milestone10version 11.0.0-milestone11version 11.0.0-milestone2version 11.0.0-milestone3 and 6 moreversion 11.0.0-milestone4version 11.0.0-milestone5version 11.0.0-milestone6version 11.0.0-milestone7version 11.0.0-milestone8version 11.0.0-milestone9 |
Vulnerable | NIST National Vulnerability Database |
| Apache Software Foundation | Traffic Server | ≥ 8.0.0 and < 8.1.9≥ 9.0.0 and < 9.2.3 | Vulnerable | NIST National Vulnerability Database |
| Apple | Swiftnio Http/2 | < 1.28.0 | Vulnerable | NIST National Vulnerability Database |
| Caddyserver | Caddy | < 2.7.5 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Business Process Automation | < 3.2.003.009 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Connected Mobile Experiences | < 11.1 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Crosswork Data Gateway | ≥ 5.0.0 and < 5.0.2< 4.1.3 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Crosswork Situation Manager | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Cisco | Crosswork Zero Touch Provisioning | < 6.0.0 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Data Center Network Manager | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Cisco | Enterprise Chat And Email | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Cisco | Expressway | < x14.3.3 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Fog Director | < 1.22 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Ios Xe | < 17.15.1 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Ios Xr | < 7.11.2 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Iot Field Network Director | < 4.11.0 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Nx-os | < 10.2\(7\)≥ 10.3\(1\) and < 10.3\(5\)≥ 10.4\(1\) and < 10.4\(2\) | Vulnerable | NIST National Vulnerability Database |
| Cisco | Prime Access Registrar | < 9.3.3 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Prime Cable Provisioning | < 7.2.1 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Prime Infrastructure | < 3.10.4 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Prime Network Registrar | < 11.2 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Secure Dynamic Attributes Connector | < 2.2.0 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Secure Firewall Threat Defense | < 7.4.2 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Secure Malware Analytics | < 2.19.2 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Secure Web Appliance Firmware | < 15.1.0 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Telepresence Video Communication Server | < x14.3.3 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Ultra Cloud Core - Policy Control Function | < 2024.01.0version 2024.01.0 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Ultra Cloud Core - Serving Gateway Function | < 2024.02.0 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Ultra Cloud Core - Session Management Function | < 2024.02.0 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Unified Attendant Console Advanced | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Cisco | Unified Contact Center Domain Manager | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Cisco | Unified Contact Center Enterprise | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Cisco | Unified Contact Center Enterprise - Live Data Server | < 12.6.2 | Vulnerable | NIST National Vulnerability Database |
| Cisco | Unified Contact Center Management Portal | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Debian | Debian Linux | version 10.0version 11.0version 12.0 | Vulnerable | NIST National Vulnerability Database |
| Dena | H2o | < 2023-10-10 | Vulnerable | NIST National Vulnerability Database |
| Eclipse Foundation | Jetty | < 9.4.53≥ 10.0.0 and < 10.0.17≥ 11.0.0 and < 11.0.17≥ 12.0.0 and < 12.0.2 | Vulnerable | NIST National Vulnerability Database |
| Envoyproxy | Envoy | version 1.24.10version 1.25.9version 1.26.4version 1.27.0 | Vulnerable | NIST National Vulnerability Database |
| F5 | Big-ip Access Policy Manager | ≥ 13.1.0 and ≤ 13.1.5≥ 14.1.0 and ≤ 14.1.5≥ 15.1.0 and ≤ 15.1.10≥ 16.1.0 and ≤ 16.1.4version 17.1.0 | Vulnerable | NIST National Vulnerability Database |
| F5 | Big-ip Advanced Firewall Manager | ≥ 13.1.0 and ≤ 13.1.5≥ 14.1.0 and ≤ 14.1.5≥ 15.1.0 and ≤ 15.1.10≥ 16.1.0 and ≤ 16.1.4version 17.1.0 | Vulnerable | NIST National Vulnerability Database |
| F5 | Big-ip Advanced Web Application Firewall | ≥ 13.1.0 and ≤ 13.1.5≥ 14.1.0 and ≤ 14.1.5≥ 15.1.0 and ≤ 15.1.10≥ 16.1.0 and ≤ 16.1.4version 17.1.0 | Vulnerable | NIST National Vulnerability Database |
| F5 | Big-ip Analytics | ≥ 13.1.0 and ≤ 13.1.5≥ 14.1.0 and ≤ 14.1.5≥ 15.1.0 and ≤ 15.1.10≥ 16.1.0 and ≤ 16.1.4version 17.1.0 | Vulnerable | NIST National Vulnerability Database |
| F5 | Big-ip Application Acceleration Manager | ≥ 13.1.0 and ≤ 13.1.5≥ 14.1.0 and ≤ 14.1.5≥ 15.1.0 and ≤ 15.1.10≥ 16.1.0 and ≤ 16.1.4version 17.1.0 | Vulnerable | NIST National Vulnerability Database |
| F5 | Big-ip Application Security Manager | ≥ 13.1.0 and ≤ 13.1.5≥ 14.1.0 and ≤ 14.1.5≥ 15.1.0 and ≤ 15.1.10≥ 16.1.0 and ≤ 16.1.4version 17.1.0 | Vulnerable | NIST National Vulnerability Database |
| F5 | Big-ip Application Visibility And Reporting | ≥ 13.1.0 and ≤ 13.1.5≥ 14.1.0 and ≤ 14.1.5≥ 15.1.0 and ≤ 15.1.10≥ 16.1.0 and ≤ 16.1.4version 17.1.0 | Vulnerable | NIST National Vulnerability Database |
| F5 | Big-ip Carrier-grade Nat | ≥ 13.1.0 and ≤ 13.1.5≥ 14.1.0 and ≤ 14.1.5≥ 15.1.0 and ≤ 15.1.10≥ 16.1.0 and ≤ 16.1.4version 17.1.0 | Vulnerable | NIST National Vulnerability Database |
| F5 | Big-ip Ddos Hybrid Defender | ≥ 13.1.0 and ≤ 13.1.5≥ 14.1.0 and ≤ 14.1.5≥ 15.1.0 and ≤ 15.1.10≥ 16.1.0 and ≤ 16.1.4version 17.1.0 | Vulnerable | NIST National Vulnerability Database |
| F5 | Big-ip Domain Name System | ≥ 13.1.0 and ≤ 13.1.5≥ 14.1.0 and ≤ 14.1.5≥ 15.1.0 and ≤ 15.1.10≥ 16.1.0 and ≤ 16.1.4version 17.1.0 | Vulnerable | NIST National Vulnerability Database |
| F5 | Big-ip Fraud Protection Service | ≥ 13.1.0 and ≤ 13.1.5≥ 14.1.0 and ≤ 14.1.5≥ 15.1.0 and ≤ 15.1.10≥ 16.1.0 and ≤ 16.1.4version 17.1.0 | Vulnerable | NIST National Vulnerability Database |
| F5 | Big-ip Global Traffic Manager | ≥ 13.1.0 and ≤ 13.1.5≥ 14.1.0 and ≤ 14.1.5≥ 15.1.0 and ≤ 15.1.10≥ 16.1.0 and ≤ 16.1.4version 17.1.0 | Vulnerable | NIST National Vulnerability Database |
| F5 | Big-ip Link Controller | ≥ 13.1.0 and ≤ 13.1.5≥ 14.1.0 and ≤ 14.1.5≥ 15.1.0 and ≤ 15.1.10≥ 16.1.0 and ≤ 16.1.4version 17.1.0 | Vulnerable | NIST National Vulnerability Database |
| F5 | Big-ip Local Traffic Manager | ≥ 13.1.0 and ≤ 13.1.5≥ 14.1.0 and ≤ 14.1.5≥ 15.1.0 and ≤ 15.1.10≥ 16.1.0 and ≤ 16.1.4version 17.1.0 | Vulnerable | NIST National Vulnerability Database |
| F5 | Big-ip Next | version 20.0.1 | Vulnerable | NIST National Vulnerability Database |
| F5 | Big-ip Next Service Proxy For Kubernetes | ≥ 1.5.0 and ≤ 1.8.2 | Vulnerable | NIST National Vulnerability Database |
| F5 | Big-ip Policy Enforcement Manager | ≥ 13.1.0 and ≤ 13.1.5≥ 14.1.0 and ≤ 14.1.5≥ 15.1.0 and ≤ 15.1.10≥ 16.1.0 and ≤ 16.1.4version 17.1.0 | Vulnerable | NIST National Vulnerability Database |
| F5 | Big-ip Ssl Orchestrator | ≥ 13.1.0 and ≤ 13.1.5≥ 14.1.0 and ≤ 14.1.5≥ 15.1.0 and ≤ 15.1.10≥ 16.1.0 and ≤ 16.1.4version 17.1.0 | Vulnerable | NIST National Vulnerability Database |
| F5 | Big-ip Webaccelerator | ≥ 13.1.0 and ≤ 13.1.5≥ 14.1.0 and ≤ 14.1.5≥ 15.1.0 and ≤ 15.1.10≥ 16.1.0 and ≤ 16.1.4version 17.1.0 | Vulnerable | NIST National Vulnerability Database |
| F5 | Big-ip Websafe | ≥ 13.1.0 and ≤ 13.1.5≥ 14.1.0 and ≤ 14.1.5≥ 15.1.0 and ≤ 15.1.10≥ 16.1.0 and ≤ 16.1.4version 17.1.0 | Vulnerable | NIST National Vulnerability Database |
| F5 | Nginx | ≥ 1.9.5 and ≤ 1.25.2 | Vulnerable | NIST National Vulnerability Database |
| F5 | Nginx Ingress Controller | ≥ 2.0.0 and ≤ 2.4.2≥ 3.0.0 and ≤ 3.3.0 | Vulnerable | NIST National Vulnerability Database |
| F5 | Nginx Plus | ≥ r25 and < r29version r29version r30 | Vulnerable | NIST National Vulnerability Database |
| Proxygen | < 2023.10.16.00 | Vulnerable | NIST National Vulnerability Database | |
| Fedoraproject | Fedora | version 37version 38 | Vulnerable | NIST National Vulnerability Database |
| Golang | Go | < 1.20.10≥ 1.21.0 and < 1.21.3 | Vulnerable | NIST National Vulnerability Database |
| Golang | Http2 | < 0.17.0 | Vulnerable | NIST National Vulnerability Database |
| Golang | Networking | < 0.17.0 | Vulnerable | NIST National Vulnerability Database |
| Grpc | Grpc | < 1.56.3≤ 1.59.2≥ 1.58.0 and < 1.58.3version 1.57.0 | Vulnerable | NIST National Vulnerability Database |
| Ietf | Http | version 2.0 | Vulnerable | NIST National Vulnerability Database |
| Istio | Istio | < 1.17.6≥ 1.18.0 and < 1.18.3≥ 1.19.0 and < 1.19.1 | Vulnerable | NIST National Vulnerability Database |
| Jenkins | Jenkins | ≤ 2.414.2≤ 2.427 | Vulnerable | NIST National Vulnerability Database |
| Kazu-yamamoto | Http2 | < 4.2.2 | Vulnerable | NIST National Vulnerability Database |
| Konghq | Kong Gateway | < 3.4.2 | Vulnerable | NIST National Vulnerability Database |
| Linecorp | Armeria | < 1.26.0 | Vulnerable | NIST National Vulnerability Database |
| Linkerd | Linkerd | ≥ 2.12.0 and ≤ 2.12.5version 2.13.0version 2.13.1version 2.14.0version 2.14.1 | Vulnerable | NIST National Vulnerability Database |
| Microsoft | .net | ≥ 6.0.0 and < 6.0.23≥ 7.0.0 and < 7.0.12 | Vulnerable | NIST National Vulnerability Database |
| Microsoft | Asp.net Core | ≥ 6.0.0 and < 6.0.23≥ 7.0.0 and < 7.0.12 | Vulnerable | NIST National Vulnerability Database |
| Microsoft | Azure Kubernetes Service | < 2023-10-08 | Vulnerable | NIST National Vulnerability Database |
| Microsoft | Cbl-mariner | < 2023-10-11 | Vulnerable | NIST National Vulnerability Database |
| Microsoft | Visual Studio 2022 | ≥ 17.0 and < 17.2.20≥ 17.4 and < 17.4.12≥ 17.6 and < 17.6.8≥ 17.7 and < 17.7.5 | Vulnerable | NIST National Vulnerability Database |
| Microsoft | Windows 10 1607 | < 10.0.14393.6351 | Vulnerable | NIST National Vulnerability Database |
| Microsoft | Windows 10 1809 | < 10.0.17763.4974 | Vulnerable | NIST National Vulnerability Database |
| Microsoft | Windows 10 21h2 | < 10.0.19044.3570 | Vulnerable | NIST National Vulnerability Database |
| Microsoft | Windows 10 22h2 | < 10.0.19045.3570 | Vulnerable | NIST National Vulnerability Database |
| Microsoft | Windows 11 21h2 | < 10.0.22000.2538 | Vulnerable | NIST National Vulnerability Database |
| Microsoft | Windows 11 22h2 | < 10.0.22621.2428 | Vulnerable | NIST National Vulnerability Database |
| Microsoft | Windows Server 2016 | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Microsoft | Windows Server 2019 | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Microsoft | Windows Server 2022 | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Netapp | Astra Control Center | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Netapp | Oncommand Insight | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Netty | Netty | < 4.1.100 | Vulnerable | NIST National Vulnerability Database |
| Nghttp2 | Nghttp2 | < 1.57.0 | Vulnerable | NIST National Vulnerability Database |
| Nodejs | Node.js | ≥ 18.0.0 and < 18.18.2≥ 20.0.0 and < 20.8.1 | Vulnerable | NIST National Vulnerability Database |
| Openresty | Openresty | < 1.21.4.3 | Vulnerable | NIST National Vulnerability Database |
| Projectcontour | Contour | < 2023-10-11 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | 3scale Api Management Platform | version 2.0 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Advanced Cluster Management For Kubernetes | version 2.0 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Advanced Cluster Security | version 3.0version 4.0 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Ansible Automation Platform | version 2.0 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Build Of Optaplanner | version 8.0 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Build Of Quarkus | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Ceph Storage | version 5.0 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Cert-manager Operator For Red Hat Openshift | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Certification For Red Hat Enterprise Linux | version 8.0version 9.0 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Cost Management | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Cryostat | version 2.0 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Decision Manager | version 7.0 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Enterprise Linux | version 6.0version 8.0version 9.0 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Fence Agents Remediation Operator | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Integration Camel For Spring Boot | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Integration Camel K | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Integration Service Registry | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Jboss A-mq | version 7 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Jboss A-mq Streams | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Jboss Core Services | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Jboss Data Grid | version 7.0.0 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Jboss Enterprise Application Platform | version 6.0.0version 7.0.0 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Jboss Fuse | version 6.0.0version 7.0.0 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Logging Subsystem For Red Hat Openshift | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Machine Deletion Remediation Operator | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Migration Toolkit For Applications | version 6.0 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Migration Toolkit For Containers | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Migration Toolkit For Virtualization | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Network Observability Operator | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Node Healthcheck Operator | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Node Maintenance Operator | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Openshift | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Openshift Api For Data Protection | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Openshift Container Platform | version 4.0 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Openshift Container Platform Assisted Installer | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Openshift Data Science | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Openshift Dev Spaces | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Openshift Developer Tools And Services | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Openshift Distributed Tracing | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Openshift Gitops | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Openshift Pipelines | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Openshift Sandboxed Containers | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Openshift Secondary Scheduler Operator | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Openshift Serverless | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Openshift Service Mesh | version 2.0 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Openshift Virtualization | version 4 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Openstack Platform | version 16.1version 16.2version 17.1 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Process Automation | version 7.0 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Quay | version 3.0.0 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Run Once Duration Override Operator | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Satellite | version 6.0 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Self Node Remediation Operator | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Service Interconnect | version 1.0 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Service Telemetry Framework | version 1.5 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Single Sign-on | version 7.0 | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Support For Spring Boot | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Red Hat | Web Terminal | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Siemens | Ruggedcom Ape1808 Firmware | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Siemens | Simatic S7-1500 Cpu 1518-4 Pn/dp Mfp Firmware | ≥ 3.1.5 | Vulnerable | NIST National Vulnerability Database |
| Siemens | Simatic S7-1500 Cpu 1518f-4 Pn/dp Mfp Firmware | ≥ 3.1.5 | Vulnerable | NIST National Vulnerability Database |
| Siemens | Sinec Ins | < 1.0version 1.0version 1.0-sp1version 1.0-sp2version 1.0-sp2_update_1version 1.0-sp2_update_2 | Vulnerable | NIST National Vulnerability Database |
| Siemens | Sinec Nms | < 3.0 | Vulnerable | NIST National Vulnerability Database |
| Siemens | Siplus S7-1500 Cpu 1518-4 Pn/dp Mfp Firmware | ≥ 3.1.5 | Vulnerable | NIST National Vulnerability Database |
| Siemens | St7 Scadaconnect | < 1.1 | Vulnerable | NIST National Vulnerability Database |
| Traefik | Traefik | < 2.10.5version 3.0.0-beta1version 3.0.0-beta2version 3.0.0-beta3 | Vulnerable | NIST National Vulnerability Database |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 7.5 | CVSS 3.1 | High | 3.9 | 3.6 | nvd@nist.gov via NIST National Vulnerability Database |
| 7.5 | CVSS 3.1 | High | 3.9 | 3.6 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 via NIST National Vulnerability Database |
| 7.5 | CVSS 3.1 | High | — | — | CISA-ADP via CVE Program (cve.org) e CISA ADP |
| 5.3 | CVSS 3.1 | Medium | — | — | GitHub, Inc. via GitHub Security Advisories |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (score shown at the top: nvd@nist.gov)
Sources disagree significantly and the divergence is under review. Every score is kept with its origin. For prioritization we use 7.5 (NVD (NIST)) as a conservative provisional reference — not a definitive official score.
Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
CISA KEV details CISA
CISA lists a CVE once it has evidence of exploitation against real targets.
Listed
Oct 10, 2023
Federal deadline
Oct 31, 2023
passed 1081 day(s) ago
Ransomware use
Unknown
CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.
Public exploits, PoCs and detection templates
Public code that demonstrates or tests the flaw raises the odds of mass exploitation — and Nuclei templates help find vulnerable assets in your environment.
Exploit-DB
- HTTP/2 2.0 - Denial Of Service (DOS) Sep 16, 2025
Proofs of concept on GitHub — 26 repositories; showing the 10 most starred
- Basic vulnerability scanning to see if web servers may be vulnerable to CVE-2023-44487 ★ 248 Oct 10, 2023
- Tool for testing mitigations and exposure to Rapid Reset DDoS (CVE-2023-44487) ★ 76 Oct 13, 2023
- Proof of concept for DoS exploit ★ 56 Oct 11, 2023
- A python based exploit to test out rapid reset attack (CVE-2023-44487) ★ 22 Oct 16, 2023
- Examples for Implementing cve-2023-44487 ( HTTP/2 Rapid Reset Attack ) Concept ★ 15 Nov 10, 2023
- threatlabindonesia/CVE-2023-44487-HTTP-2-Rapid-Reset-Exploit-PoC ★ 12 Dec 3, 2024
- Highly configurable tool to check a server's vulnerability against CVE-2023-44487 by rapidly sending HEADERS and RST_STREAM frames and documenting the server's responses. ★ 6 Nov 8, 2023
- ReToCode/golang-CVE-2023-44487 ★ 2 Oct 25, 2023
- HTTP/2 Rapid Reset Exploit PoC ★ 2 Apr 14, 2025
- poc for the rst dos attack discovered in 2023 ★ 2 Dec 14, 2025
Warning: public PoCs are sometimes disguised malware. Use them only for authorized testing in an isolated environment. This portal does not host exploit code — it only points to the sources.
EPSS over time FIRST
Oct 12, 2026 → Oct 15, 2026 · 4 reading(s) · max 100.00%
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
- Track CPU/memory spikes and availability drops correlated with request patterns.
- Hunt retroactively in logs from before Oct 10, 2023 (KEV listing): exploitation may have started earlier.
Timeline
What happened to this CVE, newest first.
- 2026
- Fix documented
- Affected products added · go/golang.org/x/net, maven/org.apache.tomcat.embed:tomcat-embed-core, swift/github.com/apple/swift-nio-http2, maven/org.
- SSVC assessment updated
- Record published
- Fix documented
- Affected products added · siemens/simatic s7-1500 cpu 1518f-4 pn/dp mfp firmware, siemens/sinec ins, siemens/sinec nms, siemens/st7 scadaconnect,
- CVSS changed · 7.5
- Source status changed · → Analyzed
- Added to CISA KEV (detected)
- Record created in this database
- 2023
- CVE published
- Added to CISA KEV catalog
Source activity
Repeated readings are counted rather than listed.
- 2× References added · Oct 13, 2026 – Oct 13, 2026
- 1× Official description updated · Oct 13, 2026 – Oct 13, 2026
References
100 on the record
- github.com/advisories/GHSA-qppj-fm5r-hxr3
- bugzilla.suse.com/show_bug.cgi
- www.haproxy.com/blog/haproxy-is-not-affected-by-the-http-2-rapid-reset-attack-cve-202
- www.debian.org/security/2023/dsa-5522
- my.f5.com/manage/s/article/K000137106
- cloud.google.com/blog/products/identity-security/how-it-works-the-novel-http2-rapid-re
- groups.google.com/g/golang-announce/c/iNNxDTCjZvo
- blog.cloudflare.com/technical-breakdown-http2-rapid-reset-ddos-attack/
- www.netlify.com/blog/netlify-successfully-mitigates-cve-2023-44487/
- istio.io/latest/news/security/istio-security-2023-004/
- github.com/dotnet/announcements/issues/277
- security.paloaltonetworks.com/CVE-2023-44487
- blog.litespeedtech.com/2023/10/11/rapid-reset-http-2-vulnerablilty/
- community.traefik.io/t/is-traefik-vulnerable-to-cve-2023-44487/20125
- linkerd.io/2023/10/12/linkerd-cve-2023-44487/
- blog.vespa.ai/cve-2023-44487/
- netty.io/news/2023/10/10/4-1-100-Final.html
- sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-http2-reset-d8
- github.com/h2o/h2o/security/advisories/GHSA-2m7v-gc89-fjqf
- www.debian.org/security/2023/dsa-5521
- github.com/caddyserver/caddy/issues/5877
- www.nginx.com/blog/http-2-rapid-reset-attack-impacting-f5-nginx-products/
- github.com/arkrwn/PoC/tree/main/CVE-2023-44487
- ubuntu.com/security/CVE-2023-44487
- cloud.google.com/blog/products/identity-security/google-cloud-mitigated-largest-ddos-a
- bugzilla.redhat.com/show_bug.cgi
- forums.swift.org/t/swift-nio-http2-security-update-cve-2023-44487-http-2-dos/67764
- access.redhat.com/security/cve/cve-2023-44487
- blog.cloudflare.com/zero-day-rapid-reset-http2-record-breaking-ddos-attack/
- github.com/kubernetes/kubernetes/pull/121120
- github.com/envoyproxy/envoy/pull/30055
- gist.github.com/adulau/7c2bfb8e9cdbe4b35a5e131c66a0c088
- mailman.nginx.org/pipermail/nginx-devel/2023-October/S36Q5HBXR7CAIMPLLPRSSSYR4PCMWILK.h
- github.com/h2o/h2o/pull/3291
- github.com/kazu-yamamoto/http2/commit/f61d41a502bd0f60eb24e1ce14edc7b6df6722a1
- msrc.microsoft.com/update-guide/vulnerability/CVE-2023-44487
- github.com/line/armeria/pull/5232
- github.com/apache/trafficserver/pull/10564
- github.com/facebook/proxygen/pull/466
- github.com/advisories/GHSA-vx74-f528-fxqg
- github.com/advisories/GHSA-xpw8-rcwv-8f8p
- github.com/nghttp2/nghttp2/pull/1961
- github.com/opensearch-project/data-prepper/issues/3474
- github.com/microsoft/CBL-Mariner/pull/6381
- github.com/etcd-io/etcd/issues/16740
- github.com/grpc/grpc-go/pull/6703
- github.com/projectcontour/contour/pull/5826
- github.com/netty/netty/commit/58f75f665aa81a8cbcf6ffa74820042a285c5e61
- github.com/linkerd/website/pull/1695/commits/4b9c6836471bc8270ab48aae6fd2181bc73
- cgit.freebsd.org/ports/commit/
- msrc.microsoft.com/blog/2023/10/microsoft-response-to-distributed-denial-of-service-ddos
- www.cisa.gov/known-exploited-vulnerabilities-catalog
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WLPRQ5
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JMEXY2
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/E72T
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZKQS
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WE2I
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KSEGD2
- cert-portal.siemens.com/productcert/html/ssa-341067.html
- www.theregister.com/2023/10/10/http2_rapid_reset_zeroday/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/E72T67
- www.vicarius.io/vsociety/posts/rapid-reset-cve-2023-44487-dos-in-http2-understanding-
- nvd.nist.gov/vuln/detail/CVE-2023-44487
- www.debian.org/security/2023/dsa-5558
- github.com/akka/akka-http/pull/4324
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VHUHTS
- github.com/apache/tomcat/tree/main/java/org/apache/coyote/http2
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FNA6
- github.com/varnishcache/varnish-cache/issues/3996
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WE2I52
- github.com/Azure/AKS/issues/3947
- github.com/dotnet/core/blob/e4613450ea0da7fd2fc6b61dfb2c1c1dec1ce9ec/release-not
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LKYHSZ
- github.com/golang/go/issues/63417
- www.theregister.com/2023/10/10/http2_rapid_reset_zeroday
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZKQS
- github.com/grpc/grpc-go/releases
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WLPR
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VHUH
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HT7T2R
- security.netapp.com/advisory/ntap-20240621-0007
- lists.w3.org/Archives/Public/ietf-http-wg/2023OctDec/0025.html
- github.com/apache/apisix/issues/10320
- security.gentoo.org/glsa/202311-09
- cert-portal.siemens.com/productcert/html/ssa-915275.html
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LKYHSZ
- blog.cloudflare.com/zero-day-rapid-reset-http2-record-breaking-ddos-attack
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CLB4
- www.openwall.com/lists/oss-security/2023/10/10/6
- seanmonstar.com/post/730794151136935936/hyper-http2-rapid-reset-unaffected
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XFOI
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2MBEPP
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WE2I
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JIZSEF
- discuss.hashicorp.com/t/hcsec-2023-32-vault-consul-and-boundary-affected-by-http-2-rapid-re
- github.com/nghttp2/nghttp2/releases/tag/v1.57.0
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZLU6
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JIZS
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZKQSIK
- github.com/apache/httpd/blob/afcdbeebbff4b0c50ea26cdd16e178c0d1f24152/modules/ht
Elsewhere on this site
Related CVEs (same products)
- Medium CVE-2026-97844 Role: DNS Server Information Disclosure Vulnerability 3d
- Medium CVE-2026-97839 Role: DNS Server Information Disclosure Vulnerability 3d
- Medium CVE-2026-97840 Role: DNS Server Information Disclosure Vulnerability 3d
- Medium CVE-2026-97841 Role: DNS Server Information Disclosure Vulnerability 3d
- Medium CVE-2026-97842 Role: DNS Server Information Disclosure Vulnerability 3d
- Medium CVE-2026-97843 Role: DNS Server Information Disclosure Vulnerability 3d
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2023-44487 is "HTTP/2 Rapid Reset Attack Vulnerability", rated High. It affects Http Server (Akka); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 7.5 describes technical severity. EPSS 100.00% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
Comments
Moderated technical discussion. Read the community guidelines.
No comments yet.
Sign in or create an account to comment and suggest corrections.