Description
The reverse proxy add forward module (mod_rpaf) 0.5 and 0.6 for the Apache HTTP Server allows remote attackers to cause a denial of service (server or application crash) via multiple X-Forwarded-For headers in a request.
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 | libapache2-mod-rpaf | 0.6-1 | — |
| Debian 13 | libapache2-mod-rpaf | 0.6-1 | — |
| Debian 12 | libapache2-mod-rpaf | 0.6-1 | — |
| Debian 6.0 | libapache2-mod-rpaf | 0.5-3+squeeze1 | DSA-2532-1 |
Advisories 1
- DSA-2532-1 libapache2-mod-rpaf - denial of service Debian Security (DSA / DLA) · Mar 9, 2026
References
- [oss-security] 20120822 CVE Request: Apache mod RPAF denial of service mailing-list
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=683984
- http://zecrazytux.net/troubleshooting/apache2-segfault-debugging-tutorial
- [oss-security] 20120822 Re: CVE Request: Apache mod RPAF denial of service mailing-list
- 55154 vdb-entry
- modrpaf-apache-dos(77987) vdb-entry
- 50400 third-party-advisory
- DSA-2532 vendor-advisory