CVE-2020-3863: Apple Mac OS X

High severity, CVSS 7.8. EPSS: 1.3% chance of exploitation in the next 30 days.

A memory corruption issue was addressed with improved memory handling. This issue is fixed in macOS Catalina 10.15.3, Security Update 2020-001 Mojave, Security Update 2020-001 High Sierra. An application may be able to execute arbitrary code with system privileges.

Affected products

• Apple Mac OS X: before 10.15.3 (fixed in 10.15.3)

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