Description
The OWASP ModSecurity Core Rule Set (CRS) is affected by a partial rule set bypass for HTTP multipart requests by submitting a payload that uses a character encoding scheme via the Content-Type or the deprecated Content-Transfer-Encoding multipart MIME header fields that will not be decoded and inspected by the web application firewall engine and the rule set. The multipart payload will therefore bypass detection. A vulnerable backend that supports these encoding schemes can potentially be exploited. 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 upgrade to 3.2.2 and 3.3.3 respectively. The mitigation against these vulnerabilities depends on the installation of the latest ModSecurity version (v2.9.6 / v3.0.8).
Published: 2022-09-20
Score: 7.3 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

No analysis available yet.

Remediation

Vendor Solution

upgrade to 3.2.2 or 3.3.3

Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-3283-1 modsecurity-apache security update
Debian DLA Debian DLA DLA-3293-1 modsecurity-crs security update
Debian DLA Debian DLA DLA-4265-1 modsecurity-crs security update
EUVD EUVD EUVD-2022-42400 The OWASP ModSecurity Core Rule Set (CRS) is affected by a partial rule set bypass for HTTP multipart requests by submitting a payload that uses a character encoding scheme via the Content-Type or the deprecated Content-Transfer-Encoding multipart MIME header fields that will not be decoded and inspected by the web application firewall engine and the rule set. The multipart payload will therefore bypass detection. A vulnerable backend that supports these encoding schemes can potentially be exploited. 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 upgrade to 3.2.2 and 3.3.3 respectively. The mitigation against these vulnerabilities depends on the installation of the latest ModSecurity version (v2.9.6 / v3.0.8).
History

Mon, 03 Nov 2025 20:30:00 +0000

Type Values Removed Values Added
References

Thu, 29 May 2025 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Subscriptions

Debian Debian Linux
Fedoraproject Fedora
Owasp Owasp Modsecurity Core Rule Set
cve-icon MITRE

Status: PUBLISHED

Assigner: NCSC.ch

Published:

Updated: 2025-11-03T19:27:30.250Z

Reserved: 2022-09-05T00:00:00.000Z

Link: CVE-2022-39956

cve-icon Vulnrichment

Updated: 2025-11-03T19:27:30.250Z

cve-icon NVD

Status : Modified

Published: 2022-09-20T07:15:12.293

Modified: 2025-11-03T20:15:56.450

Link: CVE-2022-39956

cve-icon Redhat

Severity : Moderate

Publid Date: 2022-09-19T00:00:00Z

Links: CVE-2022-39956 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses