CVE-2020-27950: Apple Multiple Products Memory Initialization Vulnerability

Medium severity, CVSS 5.5. Actively exploited: in CISA KEV since 2021-11-03. EPSS: 16.5% chance of exploitation in the next 30 days.

A memory initialization issue was addressed. 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. A malicious application may be able to disclose kernel memory.

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 macOS: before 10.15.7 (fixed in 10.15.7); 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.