CVE-2020-3851: Apple Mac OS X

High severity, CVSS 7.8. EPSS: 0.8% chance of exploitation in the next 30 days.

A use after free issue was addressed with improved memory management. This issue is fixed in macOS Catalina 10.15.4, Security Update 2020-002 Mojave, Security Update 2020-002 High Sierra, macOS Catalina 10.15.3, Security Update 2020-001 Mojave, Security Update 2020-001 High Sierra. An application may be able to gain elevated privileges.

Affected products

• Apple Mac OS X: from 10.15.2, before 10.15.3 (fixed in 10.15.3); from 10.13.6, before 10.15.4 (fixed in 10.15.4)

Published 2020-10-27. Last modified 2026-06-17.