CVE-2021-30931: Apple Mac OS X

Medium severity, CVSS 5.5. EPSS: 0.9% chance of exploitation in the next 30 days.

A logic issue was addressed with improved validation. This issue is fixed in macOS Monterey 12.0.1, macOS Big Sur 11.6.2, Security Update 2021-008 Catalina. A malicious application may be able to disclose kernel memory.

Affected products

• Apple Mac OS X: from 10.15, up to and including 10.15.7; version 10.15.7 only
• Apple macOS: after 11.0, before 11.6.2 (fixed in 11.6.2); after 12.0, before 12.1 (fixed in 12.1)

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