What’s Vulnerable › Vulnerabilities

CVE-2009-0023

• Severity: medium (CVSS 4.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 8.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2009-06-08 · updated 2026-06-16
• Weakness: CWE-119

Description

The apr_strmatch_precompile function in strmatch/apr_strmatch.c in Apache APR-util before 1.3.5 allows remote attackers to cause a denial of service (daemon crash) via crafted input involving (1) a .htaccess file used with the Apache HTTP Server, (2) the SVNMasterURI directive in the mod_dav_svn module in the Apache HTTP Server, (3) the mod_apreq2 module for the Apache HTTP Server, or (4) an application that uses the libapreq2 library, which triggers a heap-based buffer underflow.

Affected products

• Apache Apr-Util: through 1.3.4; 0.9.1, 0.9.2, 0.9.3, 0.9.4, 0.9.5, 1.0 (+14)
• Apache HTTP Server: from 2.2.0 before 2.2.12 — fixed in 2.2.12

How to fix

Upgrade to a fixed version: Apache HTTP Server 2.2.12. Check the vendor advisory for mitigations.

References

• http://lists.apple.com/archives/security-announce/2009/Nov/msg00000.html
• http://marc.info/?l=bugtraq&m=129190899612998&w=2
• http://secunia.com/advisories/34724
• http://secunia.com/advisories/35284
• http://secunia.com/advisories/35360
• http://secunia.com/advisories/35395
• http://secunia.com/advisories/35444
• http://secunia.com/advisories/35487
• http://secunia.com/advisories/35565
• http://secunia.com/advisories/35710
• http://secunia.com/advisories/35797
• http://secunia.com/advisories/35843

Get alerted when CVE-2009-0023 or the next vulnerability affects your stack