CVE-2020-3855: Apple Mac OS X

High severity, CVSS 7.1. EPSS: 0.7% chance of exploitation in the next 30 days.

An access issue was addressed with improved access restrictions. This issue is fixed in macOS Catalina 10.15.3, Security Update 2020-001 Mojave, Security Update 2020-001 High Sierra. A malicious application may be able to overwrite arbitrary files.

Affected products

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

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