CVE-2014-2900: Yassl Cyassl

Medium severity, CVSS 5.8. EPSS: 1% chance of exploitation in the next 30 days.

wolfSSL CyaSSL before 2.9.4 does not properly validate X.509 certificates with unknown critical extensions, which allows man-in-the-middle attackers to spoof servers via crafted X.509 certificate.

Affected products

• Yassl Cyassl: up to and including 2.9.0; version 0.2.0 only; version 0.3.0 only; version 0.4.0 only; version 0.5.0 only; version 0.5.5 only; …

Published 2014-04-22. Last modified 2026-06-17.