CVE-2011-3422: Apple Mac OS X

Medium severity, CVSS 4.3. EPSS: 0.9% chance of exploitation in the next 30 days.

The Keychain implementation in Apple Mac OS X 10.6.8 and earlier does not properly handle an untrusted attribute of a Certification Authority certificate, which makes it easier for man-in-the-middle attackers to spoof arbitrary SSL servers via an Extended Validation certificate, as demonstrated by https access with Safari.

Affected products

• Apple Mac OS X: up to and including 10.6.8; version 10.6.0 only; version 10.6.1 only; version 10.6.2 only; version 10.6.3 only; version 10.6.4 only; …
• Apple Mac OS X Server: up to and including 10.6.8; version 10.6.0 only; version 10.6.1 only; version 10.6.2 only; version 10.6.3 only; version 10.6.4 only; …

Published 2011-09-12. Last modified 2026-06-16.