CVE-2020-27921: Apple Mac OS X

High severity, CVSS 7.0. EPSS: 0.7% chance of exploitation in the next 30 days.

A race condition was addressed with improved state handling. This issue is fixed in macOS Big Sur 11.1, Security Update 2020-001 Catalina, Security Update 2020-007 Mojave, macOS Big Sur 11.0.1. An application may be able to execute arbitrary code with kernel privileges.

Affected products

• Apple Mac OS X: before 11.0.1 (fixed in 11.0.1); before 11.1.0 (fixed in 11.1.0)

Published 2021-04-02. Last modified 2026-06-17.