CVE-2003-0189: Apache HTTP Server

Medium severity, CVSS 5.0. EPSS: 15.1% chance of exploitation in the next 30 days.

The authentication module for Apache 2.0.40 through 2.0.45 on Unix does not properly handle threads safely when using the crypt_r or crypt functions, which allows remote attackers to cause a denial of service (failed Basic authentication with valid usernames and passwords) when a threaded MPM is used.

Affected products

• Apache HTTP Server: version 2.0.40 only; version 2.0.41 only; version 2.0.42 only; version 2.0.43 only; version 2.0.44 only; version 2.0.45 only

Published 2003-06-09. Last modified 2026-06-16.