CVE-2007-2844: PHP

High severity, CVSS 9.3. EPSS: 2.9% chance of exploitation in the next 30 days.

PHP 4.x and 5.x before 5.2.1, when running on multi-threaded systems, does not ensure thread safety for libc crypt function calls using protection schemes such as a mutex, which creates race conditions that allow remote attackers to overwrite internal program memory and gain system access.

Affected products

• PHP PHP: version 4.0 only; version 4.0.0 only; version 4.0.1 only; version 4.0.2 only; version 4.0.3 only; version 4.0.4 only; …

Published 2007-05-24. Last modified 2026-06-16.