CISA KEV Critical Insecure deserialization

CVE-2017-12149 — Red Hat JBoss Application Server Remote Code Execution Vulnerability

In Jboss Application Server as shipped with Red Hat Enterprise Application Platform 5.2, it was found that the doFilter method in the ReadOnlyAccessFilter of the HTTP Invoker does not restrict classes for which it performs deserialization and thus allowing an attacker to execute arbitrary code via crafted serialized data.

Published Oct 4, 2017 · Updated Oct 13, 2026 · Sources: CISA Known Exploited Vulnerabilities, CVE Program (cve.org) e CISA ADP, NIST National Vulnerability Database, GitHub Security Advisories · CNA: redhat

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.

CISA KEV · Dec 10, 2021 R used by ransomware (CISA) Detection templates (Nuclei) · 1 Metasploit modules · 1

How the score was calculated

Confirmed exploitation (CISA KEV)+35
Used in ransomware campaigns (CISA)+10
Public exploit/PoC (nuclei, metasploit)+16
EPSS 90.7% (30-day exploitation probability)+15
Technical severity (critical)+10
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 Dec 10, 2021

EPSS FIRST

90.71%

ahead of 100% of scored CVEs · Oct 14, 2026

Affects

Red Hat

Jboss Enterprise Application Platform

CVSS base

9.8

Critical · 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

Total

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

CISA required action CISA

Apply updates per vendor instructions.

US federal deadline: Jun 10, 2022 — passed 1588 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 (Red Hat Jboss Enterprise Application Platform).
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.
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
EPSS ahead of 100% of scored CVEs: prioritize it in the patch queue.
Search available logs for exploit probes matching the vulnerability class (insecure deserialization), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Red Hat	Jboss Enterprise Application Platform	versions not specified by the sourceversion 5.0.0version 5.0.1version 5.1.0version 5.1.1version 5.1.2version 5.2.0version 5.2.1 and 1 more version 5.2.2	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

High

Integrity

High

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
9.8	CVSS 3.1	Critical	3.9	5.9	nvd@nist.gov via NIST National Vulnerability Database
9.8	CVSS 3.1	Critical	3.9	5.9	134c704f-9b21-4f2e-91b3-4a467353bcc0 via NIST National Vulnerability Database
9.8	CVSS 3.1	Critical	—	—	CISA-ADP via CVE Program (cve.org) e CISA ADP
9.8	CVSS 3.0	Critical	—	—	GitHub, Inc. via GitHub Security Advisories
7.5	CVSS 2.0	High	10.0	6.4	nvd@nist.gov via NIST National Vulnerability Database

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (score shown at the top: nvd@nist.gov)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-502 · Deserialization of Untrusted Data

Other CVEs with this weakness →

CISA KEV details CISA

CISA lists a CVE once it has evidence of exploitation against real targets.

Listed

Dec 10, 2021

Federal deadline

Jun 10, 2022

passed 1588 day(s) ago

Ransomware use

Known

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.

Detection templates (Nuclei)

Jboss Application Server - Remote Code Execution

Metasploit modules

JBoss Vulnerability Scanner normal

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 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 90.71%

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).
Monitor serialized objects in requests and unexpected processes spawned by the runtime.
Hunt retroactively in logs from before Dec 10, 2021 (KEV listing): exploitation may have started earlier.

web/proxy/WAF logsnetwork IDS/IPSendpoint telemetry (EDR)application logs

Timeline

What happened to this CVE, newest first.

2026
Affected products added · redhat/jboss enterprise application platform
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · Published → Analyzed
Oct 13, 2026 · NIST National Vulnerability Database
Record published
Oct 13, 2026
CVSS changed · 9.8
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Published
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Added to CISA KEV (detected)
Oct 13, 2026 · CISA Known Exploited Vulnerabilities
Record created in this database
Oct 13, 2026 · CISA Known Exploited Vulnerabilities
2021
Added to CISA KEV catalog
Dec 9, 2021 · CISA
2017
CVE published
Oct 4, 2017 · redhat

Source activity

Repeated readings are counted rather than listed.

3× References added · Oct 13, 2026 – Oct 13, 2026
1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

8 on the record

www.cisa.gov/known-exploited-vulnerabilities-catalog
US Government Resource, NIST National Vulnerability Database
www.securityfocus.com/bid/100591
vdb-entry, x_refsource_BID, Third Party Advisory, VDB Entry, CVE Program (cve.org) e CISA ADP
github.com/advisories/GHSA-j5r3-wq62-8gp5
GitHub Security Advisories
access.redhat.com/errata/RHSA-2018:1607
vendor-advisory, x_refsource_REDHAT, Third Party Advisory, CVE Program (cve.org) e CISA ADP
github.com/gottburgm/Exploits/tree/master/CVE-2017-12149
x_refsource_MISC, Third Party Advisory, CVE Program (cve.org) e CISA ADP
access.redhat.com/errata/RHSA-2018:1608
vendor-advisory, x_refsource_REDHAT, Third Party Advisory, CVE Program (cve.org) e CISA ADP
nvd.nist.gov/vuln/detail/CVE-2017-12149
GitHub Security Advisories
bugzilla.redhat.com/show_bug.cgi
x_refsource_CONFIRM, Issue Tracking, CVE Program (cve.org) e CISA ADP

Elsewhere on this site

Red Hat
every CVE for this vendor

2021-12
what else CISA listed that month

Insecure deserialization
same class

CWE-502
other pages naming this weakness

Related CVEs (same products)

Critical CVE-2026-28369 Undertow: undertow: request smuggling via malformed http request headers Mar 27, 2026
Critical CVE-2026-28368 Undertow: undertow: request smuggling via inconsistent header parsing Mar 27, 2026
Critical CVE-2026-28367 Undertow: undertow: request smuggling via `\r\r\r` as a header block terminator Mar 27, 2026
High CVE-2026-3121 Keycloak: org.keycloak/keycloak-services: keycloak: privilege escalation via manage-clients permission Mar 26, 2026
Low CVE-2026-4874 Org.keycloak.protocol.oidc.grants: org.keycloak.services.managers: keycloak: server-side request forgery via oidc token endpoint manipulation Mar 26, 2026
Medium CVE-2026-4366 Keycloak-services: blind server-side request forgery (ssrf) via http redirect handling in keycloak Mar 18, 2026

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 fixed version, patch or mitigation documented.
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-2017-12149 is "Red Hat JBoss Application Server Remote Code Execution Vulnerability", rated Critical. It affects Jboss Enterprise Application Platform (Red Hat); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 9.8 describes technical severity. EPSS 90.71% 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.

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