CVE-2020-27936: Apple Mac OS X

High severity, CVSS 7.1. EPSS: 0.3% chance of exploitation in the next 30 days.

An out-of-bounds read issue existed that led to the disclosure of kernel memory. This was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.1, Security Update 2020-001 Catalina, Security Update 2020-007 Mojave. A local user may be able to cause unexpected system termination or read kernel memory.

Affected products

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

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