Description
fcgid_spawn_ctl.c in the mod_fcgid module 2.3.6 for the Apache HTTP Server does not recognize the FcgidMaxProcessesPerClass directive for a virtual host, which makes it easier for remote attackers to cause a denial of service (memory consumption) via a series of HTTP requests that triggers a process count higher than the intended limit.
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-fcgid | 1:2.3.6-1.1 | — |
| Debian 13 | libapache2-mod-fcgid | 1:2.3.6-1.1 | — |
| Debian 12 | libapache2-mod-fcgid | 1:2.3.6-1.1 | — |
| Debian 6.0 | libapache2-mod-fcgid | 1:2.3.6-1+squeeze1 | DSA-2436-1 |
Advisories 1
- DSA-2436-1 libapache2-mod-fcgid - inactive resource limits Debian Security (DSA / DLA) · Mar 9, 2026
References
- [oss-security] 20120315 Re: CVE-request: apache's mod-fcgid does not respect configured FcgidMaxProcessesPerClass in VirtualHost mailing-list
- apache-modfcgid-dos(74181) vdb-entry
- DSA-2436 vendor-advisory
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=615814
- 52565 vdb-entry
- https://issues.apache.org/bugzilla/show_bug.cgi?id=49902
- [oss-security] 20120315 CVE-request: apache's mod-fcgid does not respect configured FcgidMaxProcessesPerClass in VirtualHost mailing-list