CVE-2021-30805: Apple Mac OS X

Critical severity, CVSS 9.8. EPSS: 3.1% chance of exploitation in the next 30 days.

A memory corruption issue was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.5, Security Update 2021-004 Catalina, Security Update 2021-005 Mojave. An application may be able to execute arbitrary code with kernel privileges.

Affected products

• Apple Mac OS X: from 10.14, up to and including 10.14.6; from 10.15, up to and including 10.15.7; version 10.14.6 only; version 10.15.6 only; version 10.15.7 only
• Apple macOS: from 11.0, before 11.5 (fixed in 11.5)

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