CVE catalog
CVE-2022-39955
modsecurity-crs: CVE-2022-39955
- Severity
- Medium
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 1.42% · Oct 25, 2026
The OWASP ModSecurity Core Rule Set (CRS) is affected by a partial rule set bypass by submitting a specially crafted HTTP Content-Type header field that indicates multiple character encoding schemes. A vulnerable back-end can potentially be exploited by declaring multiple Content-Type "charset" names and therefore bypassing the configurable CRS Content-Type header "charset" allow list. An encoded payload can bypass CRS detection this way and may then be decoded by the backend. 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.
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: