CVE-2021-30938: Apple Mac OS X

High severity, CVSS 7.7. EPSS: 0.3% chance of exploitation in the next 30 days.

This issue was addressed with improved checks. This issue is fixed in macOS Monterey 12.1, Security Update 2021-008 Catalina, macOS Big Sur 11.6.2. A local user may be able to cause unexpected system termination or read kernel memory.

Affected products

• Apple Mac OS X: from 10.15, before 10.15.7 (fixed in 10.15.7); version 10.15.7 only
• Apple macOS: from 11.0, before 11.6.2 (fixed in 11.6.2); from 12.0.0, up to and including 12.1

Published 2021-08-24. Last modified 2026-06-17.