CVE-2021-1829: Apple macOS

Critical severity, CVSS 9.8. EPSS: 2.3% chance of exploitation in the next 30 days.

A type confusion issue was addressed with improved state handling. This issue is fixed in macOS Big Sur 11.3. An application may be able to execute arbitrary code with kernel privileges.

Affected products

• Apple macOS: from 11.0, before 11.3 (fixed in 11.3)

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