CVE-2015-5894: Apple Mac OS X

Medium severity, CVSS 4.3. EPSS: 0.8% chance of exploitation in the next 30 days.

The X.509 certificate-trust implementation in Apple OS X before 10.11 does not recognize that the kSecRevocationRequirePositiveResponse flag implies a revocation-checking requirement, which makes it easier for man-in-the-middle attackers to spoof endpoints by leveraging access to a revoked certificate.

Affected products

• Apple Mac OS X: up to and including 10.10.5

Published 2015-10-09. Last modified 2026-06-17.