CVE-2018-4304: Apple iPhone OS

Medium severity, CVSS 5.0. EPSS: 0.9% chance of exploitation in the next 30 days.

A denial of service issue was addressed with improved validation. This issue affected versions prior to iOS 12, macOS Mojave 10.14, tvOS 12, watchOS 5.

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)
• Apple watchOS: before 5.0 (fixed in 5.0)

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