CVE-2015-8838: PHP

Medium severity, CVSS 5.9. EPSS: 1.7% chance of exploitation in the next 30 days.

ext/mysqlnd/mysqlnd.c in PHP before 5.4.43, 5.5.x before 5.5.27, and 5.6.x before 5.6.11 uses a client SSL option to mean that SSL is optional, which allows man-in-the-middle attackers to spoof servers via a cleartext-downgrade attack, a related issue to CVE-2015-3152.

Affected products

• PHP PHP: version 5.5.0 only; version 5.5.1 only; version 5.5.2 only; version 5.5.3 only; version 5.5.4 only; version 5.5.5 only; …

Published 2016-05-16. Last modified 2026-06-17.