CVE-2021-1814: Apple macOS

High severity, CVSS 7.8. EPSS: 1.2% chance of exploitation in the next 30 days.

This issue was addressed with improved checks. This issue is fixed in macOS Big Sur 11.3, watchOS 7.4. Processing a maliciously crafted image may lead to arbitrary code execution.

Affected products

• Apple macOS: before 11.3 (fixed in 11.3)
• Apple watchOS: before 7.4 (fixed in 7.4)

Published 2021-09-08. Last modified 2026-06-17.