CVE-2011-3253: Apple iPhone OS

Low severity, CVSS 2.6. EPSS: 0.6% chance of exploitation in the next 30 days.

CalDAV in Apple iOS before 5 does not validate X.509 certificates for SSL sessions, which allows man-in-the-middle attackers to spoof calendar servers and obtain sensitive information via an arbitrary certificate.

Affected products

• Apple iPhone OS: version 3.0 only; version 3.1 only; version 3.1.2 only; version 3.1.3 only; version 3.2 only; version 3.2.1 only; …

Published 2011-10-14. Last modified 2026-06-16.