CVE-2020-3843: Apple iPhone OS

High severity, CVSS 8.8. EPSS: 3.6% chance of exploitation in the next 30 days.

A memory corruption issue was addressed with improved input validation. This issue is fixed in iOS 12.4.7, watchOS 5.3.7. A remote attacker may be able to cause unexpected system termination or corrupt kernel memory.

Affected products

• Apple iPhone OS: before 12.4.7 (fixed in 12.4.7)
• Apple watchOS: before 5.3.7 (fixed in 5.3.7)

Published 2020-02-27. Last modified 2026-06-17.