CVE-2018-4321: Apple iPhone OS

Medium severity, CVSS 5.3. EPSS: 1.3% chance of exploitation in the next 30 days.

A validation issue existed in the entitlement verification. This issue was addressed with improved validation of the process entitlement. This issue affected versions prior to iOS 12, macOS Mojave 10.14, tvOS 12.

Affected products

• Apple iPhone OS: before 12.0 (fixed in 12.0)
• Apple Mac OS X: before 10.14 (fixed in 10.14)
• Apple tvOS: before 12 (fixed in 12)

Published 2019-04-03. Last modified 2026-06-17.