CVE-2022-31813 — mod_proxy X-Forwarded-For dropped by hop-by-hop mechanism

Triage

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

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.

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, Fedoraproject Fedora, Netapp Clustered Data Ontap).
2. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
3. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
4. Search available logs for exploit probes matching the vulnerability class (integrity), 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-345 · Insufficient Verification of Data Authenticity

Other CVEs with this weakness →

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).

Timeline

What happened to this CVE, newest first.

• 2026
• Affected products added · apache software foundation/apache http server
  Oct 19, 2026 · CVE Program (cve.org) e CISA ADP
• Record published
  Oct 19, 2026
• Affected products added · apache/http server, netapp/clustered data ontap, fedoraproject/fedora
  Oct 19, 2026 · NIST National Vulnerability Database
• CVSS changed · 9.8
  Oct 19, 2026 · NIST National Vulnerability Database
• Source status changed · → Analyzed
  Oct 19, 2026 · NIST National Vulnerability Database
• Record created in this database
  Oct 19, 2026 · Alertas do Telegram
• 2022
• CVE published
  Jun 9, 2022 · apache

Source activity

Repeated readings are counted rather than listed.

• 2× References added · Oct 19, 2026 – Oct 19, 2026
• 1× Official description updated · Oct 19, 2026 – Oct 19, 2026

References

13 on the record

• httpd.apache.org/security/vulnerabilities_24.html
  Vendor Advisory, x_refsource_MISC, NIST National Vulnerability Database
• security.netapp.com/advisory/ntap-20220624-0005
  GitHub Security Advisories
• nvd.nist.gov/vuln/detail/CVE-2022-31813
  GitHub Security Advisories
• lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7QUG
  Third Party Advisory, vendor-advisory, x_refsource_FEDORA, NIST National Vulnerability Database
• lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7QUGG2
  GitHub Security Advisories
• security.netapp.com/advisory/ntap-20220624-0005/
  Third Party Advisory, x_refsource_CONFIRM, NIST National Vulnerability Database
• www.openwall.com/lists/oss-security/2022/06/08/8
  Mailing List, Third Party Advisory, mailing-list, x_refsource_MLIST, NIST National Vulnerability Database
• lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YPY2
  GitHub Security Advisories
• security.gentoo.org/glsa/202208-20
  Third Party Advisory, vendor-advisory, x_refsource_GENTOO, NIST National Vulnerability Database
• lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7QUG
  GitHub Security Advisories
• github.com/advisories/GHSA-4xc6-mgv4-5v44
  GitHub Security Advisories
• lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YPY2
  Third Party Advisory, vendor-advisory, x_refsource_FEDORA, NIST National Vulnerability Database
• lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YPY2BL
  GitHub Security Advisories

Elsewhere on this site

Related CVEs (same products)

• High CVE-2026-93546 Apache HTTP Server: mod_dav_fs namespace overflow 19d
• High CVE-2026-73637 Apache HTTP Server: mod_auth_digest DoS attack 19d
• Medium CVE-2026-79768 Apache HTTP Server: mod_userdir information disclosure 19d
• High CVE-2026-73636 Apache HTTP Server: mod_auth_digest one-time-nonce replay attack 19d
• High CVE-2026-63718 Apache HTTP Server: mod_proxy_uwsgi Transfer-Encoding response smuggling 19d
• Medium CVE-2026-58415 Apache HTTP Server: mod_dav_fs property database read access 19d

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 CISA SSVC assessment.
• 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-2022-31813 is "mod_proxy X-Forwarded-For dropped by hop-by-hop mechanism", rated Critical. It affects Apache HTTP Server (Apache Software Foundation); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 9.8 describes technical severity. EPSS 3.54% 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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