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No exploitation reportedFix available

CVE-2022-39957

No exploitation reported by the sources we read.

  • Published2022-09-20
  • WeaknessCWE-116 · CWE-693

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The OWASP ModSecurity Core Rule Set (CRS) is affected by a response body bypass. A client can issue an HTTP Accept header field containing an optional "charset" parameter in order to receive the response in an encoded form. Depending on the "charset", this response can not be decoded by the web application firewall. A restricted resource, access to which would ordinarily be detected, may therefore bypass detection. The legacy CRS versions 3.0.x and 3.1.x are affected, as well as the currently supported versions 3.2.1 and 3.3.2. Integrators and users are advised to upgrade to 3.2.2 and 3.3.3 respectively.

Timeline

dates in UTC
  1. 2022-09-2007:15CVE publishedNVD

Versions per branch

NVD
Fedoraproject fedora
BranchAffectedFixed in
35.x= 35no fix published
36.x= 36no fix published
37.x= 37no fix published
Owasp owasp modsecurity core rule set
BranchAffectedFixed in
3.3≥ 3.3.0, < 3.3.33.3.3
3.x≥ 3.0.0, < 3.2.23.2.2
Debian debian linux
BranchAffectedFixed in
10.0= 10.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As NCSC.ch, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • OWASP ModSecurity Core Rule Set
    Affected
    • = 3.0.xno fix stated
    • = 3.1.xno fix stated
    • ≤ 3.2.1no fix statedcustom
    • ≤ 3.3.2no fix statedcustom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2023-05-21

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • apache-mod_security-crsMageia:9all versions · fixed in 3.3.5-1.mga9
  • mod_security_crsopenEuler:22.03-LTSall versions · fixed in 3.2.2-1.oe2203
  • mod_security_crsopenEuler:20.03-LTS-SP3all versions · fixed in 3.2.2-1.oe1
  • mod_security_crsopenEuler:20.03-LTS-SP1all versions · fixed in 3.2.2-1.oe1
  • modsecurity-crsUbuntu:26.10all versions · no fixed version listed
  • modsecurity-crsUbuntu:26.04:LTSall versions · no fixed version listed
  • modsecurity-crsUbuntu:25.10all versions · no fixed version listed
  • modsecurity-crsUbuntu:24.04:LTSall versions · no fixed version listed

9 more package ranges on OSV.dev

Vendor advisories

  • CVE-2022-39957 Red Hat Product Security3 known affected

    mod_security_crs: Charset accept header field resulting in response rule set bypass

    mod_security_crs.src as a component of Red Hat Enterprise Linux 7 · mod_security_crs.src as a component of Red Hat Enterprise Linux 8 · mod_security_crs.src as a component of Red Hat Enterprise Linux 9

Full record on NVD

Fix

  1. No fix planned, says the vendor Red Hat Product Security CVE-2022-39957 · 1 productOut of support scope
  2. No fix planned, says the vendor Red Hat Product Security CVE-2022-39957 · 2 productsWill not fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionnone2025-05-29
  • CNACVSS 3.17.3known since 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • CNAweakness (CWE)CWE-693known since 2026-10-23
  • NVDweakness (CWE)CWE-116read 2026-10-23
  • FIRST EPSSEPSS score1.0 %2026-11-08
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

  • EUVD-2022-42401same flawENISA EUVD · LicenseRef-ENISA-legal-notice
  • GHSA-cxqq-h5hh-jgq2same flawGitHub Advisory Database · CC-BY-4.0
  • DLA-3293-1advisory covering several CVEsDebian · LicenseRef-unstated
  • DLA-4265-1advisory covering several CVEsDebian · LicenseRef-unstated
  • MGASA-2024-0070advisory covering several CVEsMageia · LicenseRef-unstated
  • OESA-2022-1970advisory covering several CVEsopenEuler · LicenseRef-unstated

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2022-09-20
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-cxqq-h5hh-jgq2

Frequently asked questions

What is CVE-2022-39957?

The OWASP ModSecurity Core Rule Set (CRS) is affected by a response body bypass. A client can issue an HTTP Accept header field containing an optional "charset" parameter in order to receive the response in an encoded form. Depending on the "charset", this response can not be decoded by the web application firewall. A restricted resource, access to which would ordinarily be detected, may therefore bypass detection. The legacy CRS versions 3.0.x and 3.1.x are affected, as well as the currently supported versions 3.2.1 and 3.3.2. Integrators and users are advised to upgrade to 3.2.2 and 3.3.3 respectively.

Is CVE-2022-39957 actively exploited?

Active exploitation of CVE-2022-39957 has not been confirmed. Its EPSS score was 1.0% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2022-39957?

CVE-2022-39957 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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