CVE catalog
CVE-2022-39956
modsecurity-crs: CVE-2022-39956
- Severity
- Medium
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 1.21% · Oct 25, 2026
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).
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | modsecurity-crs | sid | 3.3.9-1 | fixed |
| Debian | modsecurity-crs | forky | 3.3.9-1 | fixed |
| Debian | modsecurity-crs | trixie | 3.3.7-1+deb13u2 | fixed |
| Debian | modsecurity-crs | trixie-security | 3.3.7-1+deb13u1 | fixed |
| Debian | modsecurity-crs | bookworm | 3.3.4-1+deb12u3 | fixed |
| Debian | modsecurity-crs | bookworm-security | 3.3.4-1+deb12u1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | modsecurity-crs | source | sid | 3.3.4-1 | not yet assigned | Not reported | [1021137] |
| Debian | modsecurity-crs | source | forky | 3.3.4-1 | not yet assigned | Not reported | [1021137] |
| Debian | modsecurity-crs | source | trixie | 3.3.4-1 | not yet assigned | Not reported | [1021137] |
| Debian | modsecurity-crs | source | bookworm | 3.3.4-1 | not yet assigned | Not reported | [1021137] |
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
[Debian 12 (Bookworm)]
- [modsecurity-crs]Unknown
Details (4)
3.3.4-1+deb12u3· all · bookwormFixed · Fixed:
3.3.4-1dsa · modsecurity-crs · debian · bookworm
3.3.4-1+deb12u3· all · bookwormFixed · Fixed:
3.3.4-1dsa · modsecurity-crs · debian · bookworm
3.3.4-1+deb12u1· all · bookworm-securityFixed · Fixed:
3.3.4-1dsa · modsecurity-crs · debian · bookworm
3.3.4-1+deb12u1· all · bookworm-securityFixed · Fixed:
3.3.4-1dsa · modsecurity-crs · debian · bookworm
Observed: