Description
The mod_security2 module before 2.7.0 for the Apache HTTP Server allows remote attackers to bypass rules, and deliver arbitrary POST data to a PHP application, via a multipart request in which an invalid part precedes the crafted data.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | modsecurity-apache | 2.6.6-5 | — |
| Debian 13 | modsecurity-apache | 2.6.6-5 | — |
| Debian 12 | modsecurity-apache | 2.6.6-5 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | apache2-mod_security2 | 2.9.0-5.6 | openSUSE-SU-2024:10034-1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- ModSecurity - 'POST' Security Bypass EDB-37949 · remote · Oct 17, 2012 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 1
- openSUSE-SU-2024:10034-1 apache2-mod_security2-2.9.0-5.6 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- openSUSE-SU-2013:1342 vendor-advisory
- https://www.sec-consult.com/fxdata/seccons/prod/temedia/advisories_txt/20121017-0_mod_security_ruleset_bypass.txt
- http://mod-security.svn.sourceforge.net/viewvc/mod-security?view=revision&sortby=date&revision=2081
- openSUSE-SU-2013:1331 vendor-advisory
- http://mod-security.svn.sourceforge.net/viewvc/mod-security/m2/branches/2.7.x/CHANGES
- http://mod-security.svn.sourceforge.net/viewvc/mod-security/m2/trunk/apache2/msc_multipart.c?sortby=date&r1=2081&r2=2080&pathrev=2081
- 20121017 SEC Consult SA-20121017-0 :: ModSecurity multipart/invalid part ruleset bypass mailing-list
- FEDORA-2012-18278 vendor-advisory
- [oss-security] 20121018 Re: CVE request: Fwd: [Full-disclosure] SEC Consult SA-20121017-0 :: ModSecurity multipart/invalid part ruleset bypass mailing-list
- openSUSE-SU-2013:1336 vendor-advisory