CVE-2020-27930: Apple Multiple Products Memory Corruption Vulnerability

High severity, CVSS 7.8. Actively exploited: in CISA KEV since 2021-11-03. EPSS: 22% chance of exploitation in the next 30 days.

A memory corruption issue was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9, watchOS 6.2.9, Security Update 2020-006 High Sierra, Security Update 2020-006 Mojave, iOS 14.2 and iPadOS 14.2, watchOS 5.3.9, macOS Catalina 10.15.7 Supplemental Update, macOS Catalina 10.15.7 Update. Processing a maliciously crafted font may lead to arbitrary code execution.

Affected products

• Apple iPadOS: before 14.2 (fixed in 14.2)
• Apple iPhone OS: before 12.4.9 (fixed in 12.4.9); from 14.0, before 14.2 (fixed in 14.2)
• Apple Mac OS X: before 10.15.7 (fixed in 10.15.7)
• Apple macOS: from 11.0, before 11.0.1 (fixed in 11.0.1)
• Apple watchOS: before 5.3.9 (fixed in 5.3.9); from 6.0, before 6.2.9 (fixed in 6.2.9); from 7.0, before 7.1 (fixed in 7.1)

Published 2020-12-08. Last modified 2026-06-17.