CVE-2019-8637: Apple iPhone OS

High severity, CVSS 7.8. EPSS: 1% chance of exploitation in the next 30 days.

An input validation issue was addressed with improved input validation. This issue is fixed in iOS 12.3, tvOS 12.3, watchOS 5.2.1. A malicious application may be able to gain root privileges.

Affected products

• Apple iPhone OS: before 12.3 (fixed in 12.3)
• Apple tvOS: before 12.3 (fixed in 12.3)
• Apple watchOS: before 5.2.1 (fixed in 5.2.1)

Published 2019-12-18. Last modified 2026-06-17.