CVE-2009-0023: Apache Apr-Util

Medium severity, CVSS 4.3. EPSS: 8.5% chance of exploitation in the next 30 days.

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: up to and including 1.3.4; version 0.9.1 only; version 0.9.2 only; version 0.9.3 only; version 0.9.4 only; version 0.9.5 only; …
• Apache HTTP Server: from 2.2.0, before 2.2.12 (fixed in 2.2.12)

Published 2009-06-08. Last modified 2026-06-16.