CVE-2015-5851: Apple iPhone OS

Low severity, CVSS 2.1. EPSS: 0.4% chance of exploitation in the next 30 days.

The convenience initializer in the Multipeer Connectivity component in Apple iOS before 9 does not require an encrypted session, which allows local users to obtain cleartext multipeer data via an encrypted-to-unencrypted downgrade attack.

Affected products

• Apple iPhone OS: up to and including 8.4.1
• Apple Mac OS X: up to and including 10.10.5

Published 2015-09-18. Last modified 2026-06-17.