CVE-2019-8633: Apple iPhone OS

High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days.

A validation issue was addressed with improved input sanitization. This issue is fixed in macOS Mojave 10.14.5, Security Update 2019-003 High Sierra, Security Update 2019-003 Sierra, iOS 12.3, tvOS 12.3, watchOS 5.3. An application may be able to read restricted memory.

Affected products

• Apple iPhone OS: before 12.3 (fixed in 12.3)
• Apple Mac OS X: from 10.13.6, before 10.14.5 (fixed in 10.14.5)
• Apple tvOS: before 12.3 (fixed in 12.3)
• Apple watchOS: before 5.3 (fixed in 5.3)

Published 2020-10-27. Last modified 2026-06-17.