Description
The ModSecurity module before 2.7.4 for the Apache HTTP Server allows remote attackers to cause a denial of service (NULL pointer dereference, process crash, and disk consumption) via a POST request with a large body and a crafted Content-Type header.
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 | 2.6.6-9 | — |
| Debian 13 | modsecurity-apache | 2.6.6-9 | — |
| Debian 12 | modsecurity-apache | 2.6.6-9 | — |
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 - Remote Null Pointer Dereference EDB-25852 · dos · May 31, 2013
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
- [mod-security-users] 20130527 Availability of ModSecurity 2.7.4 Stable Release mailing-list
- openSUSE-SU-2013:1342 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=967615
- openSUSE-SU-2013:1331 vendor-advisory
- 20130528 [SECURITY][CVE-2013-2765][ModSecurity] Remote Null Pointer Dereference mailing-list
- https://raw.github.com/SpiderLabs/ModSecurity/master/CHANGES
- http://www.shookalabs.com/
- http://www.modsecurity.org/
- https://github.com/shookalabs/exploits/blob/master/modsecurity_cve_2013_2765_check.py
- https://github.com/SpiderLabs/ModSecurity/commit/0840b13612a0b7ef1ce7441cf811dcfc6b463fba
- openSUSE-SU-2013:1336 vendor-advisory