CVE-2015-5859: Apple iPhone OS

Medium severity, CVSS 4.3. EPSS: 1.5% chance of exploitation in the next 30 days.

The CFNetwork HTTPProtocol component in Apple iOS before 9 and OS X before 10.11 does not properly recognize the HSTS preload list during a Safari private-browsing session, which makes it easier for remote attackers to obtain sensitive information by sniffing the network.

Affected products

• Apple iPhone OS: up to and including 8.4.1
• Apple Mac OS X: up to and including 10.10.4

Published 2015-11-22. Last modified 2026-06-17.