CVE-2009-0023 Memory corruption in n/a

What is CVE-2009-0023?

CVE-2009-0023 is a medium-severity memory corruption vulnerability in Apache Http Server, published on 6 Jun 2009. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-119

Which versions are affected by CVE-2009-0023?

It affects 2 products.

Products include Apache Apr-Util, Apache Http Server.

How do I fix CVE-2009-0023?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2009-0023 being exploited?

There is no known exploitation of CVE-2009-0023 in the wild and no public exploit code.

Other vulnerabilities in Apache Http Server

• CVE-2009-2412 Integer overflow in n/a Critical 10.0
• CVE-2026-32327 Apache Portable Runtime Utility: apr-util XML stack recursion crash Critical 9.1
• CVE-2026-34191 Apache Portable Runtime Utility: SQL Injection in apr_dbd_oracle Critical 9.1
• CVE-2025-49506 Apache Portable Runtime Utility: apr_password_validate() vulnerable to timing attack High 7.5
• CVE-2026-34501 Apache Portable Runtime Utility: Heap buffer overflow in APR redis client High 7.5

All Apache Http Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2009-0023, GHSA-8jp8-5574-2q6q.