CVE-2024-38475 — Apache HTTP Server Improper Escaping of Output Vulnerability

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

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.

Remediation

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

• Documented patch — github.com (NIST National Vulnerability Database)

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: May 22, 2025 — passed 511 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.

1. Identify exposed assets running the affected vendor/product/version combinations (Apache Software Foundation Apache HTTP Server, Netapp Ontap 9, Sonicwall Sma 200 Firmware…).
2. Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
3. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
4. Apply the fixed version or the patch documented under Remediation.
5. EPSS ahead of 100% of scored CVEs: prioritize it in the patch queue.
6. Search available logs for exploit probes matching the vulnerability class (input validation), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-116 · Improper Encoding or Escaping of Output

Other CVEs with this weakness →

CISA KEV details CISA

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

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.

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 14, 2026 · 3 reading(s) · max 99.96%

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).
• Hunt retroactively in logs from before May 1, 2025 (KEV listing): exploitation may have started earlier.

Timeline

What happened to this CVE, newest first.

• 2026
• Fix documented
  Oct 13, 2026 · NIST National Vulnerability Database
• Affected products added · apache/http server, netapp/ontap 9, sonicwall/sma 200 firmware, sonicwall/sma 210 firmware, sonicwall/sma 400 firmware,
  Oct 13, 2026 · NIST National Vulnerability Database
• Source status changed · Published → Analyzed
  Oct 13, 2026 · NIST National Vulnerability Database
• Record published
  Oct 13, 2026
• Affected products added · apache software foundation/apache http server
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• CVSS changed · 9.1
  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
• 2025
• Added to CISA KEV catalog
  Apr 30, 2025 · CISA
• 2024
• CVE published
  Jul 1, 2024 · apache

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

10 on the record

• httpd.apache.org/security/vulnerabilities_24.html
  vendor-advisory, Vendor Advisory, CVE Program (cve.org) e CISA ADP
• github.com/apache/httpd/commit/9a6157d1e2f7ab15963020381054b48782bc18cf
  Patch, NIST National Vulnerability Database
• github.com/advisories/GHSA-pf44-j75v-mhr8
  GitHub Security Advisories
• security.netapp.com/advisory/ntap-20240712-0001/
  Third Party Advisory, CVE Program (cve.org) e CISA ADP
• nvd.nist.gov/vuln/detail/CVE-2024-38475
  GitHub Security Advisories
• security.netapp.com/advisory/ntap-20240712-0001
  GitHub Security Advisories
• www.cisa.gov/known-exploited-vulnerabilities-catalog
  Third Party Advisory, US Government Resource, NIST National Vulnerability Database
• psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0018
  Third Party Advisory, NIST National Vulnerability Database
• www.blackhat.com/us-24/briefings/schedule/index.html
  Third Party Advisory, NIST National Vulnerability Database
• www.openwall.com/lists/oss-security/2024/07/01/8
  Third Party Advisory, NIST National Vulnerability Database

Elsewhere on this site

Related CVEs (same products)

• High CVE-2026-63718 Apache HTTP Server: mod_proxy_uwsgi Transfer-Encoding response smuggling 14d
• High CVE-2026-48005 Apache HTTP Server: mod_auth_digest reauthentication attack 14d
• High CVE-2026-46729 Apache HTTP Server: mod_heartmonitor denial of service 14d
• Low CVE-2026-42356 Apache HTTP Server: limited RCE for some internal redirects to non-CGI files in CGI directories 14d
• Medium CVE-2026-42528 Apache HTTP Server: mod_dav shared lock overflow 14d
• High CVE-2026-49975 Apache HTTP Server: mod_http2 denial of service Jun 8, 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 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-2024-38475 is "Apache HTTP Server Improper Escaping of Output Vulnerability", rated Critical. It affects Apache HTTP Server (Apache Software Foundation); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 9.1 describes technical severity. EPSS 99.96% 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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