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CVE-2020-27950

Known Exploited (CISA KEV)MEDIUM

5.5

CVSS Severity Score

EPSS Score72.9130%

EPSS Percentile91.68th

PublishedDec 8, 2020

Last ModifiedOct 27, 2025

Vulnerability Description

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 Platforms (CPE)

💻

Apple

Ipados

< 14.2

💻

Apple

Iphone Os

< 12.4.9

💻

Apple

Iphone Os

>= 14.0 and < 14.2

💻

Apple

Macos

< 10.15.7

💻

Apple

Macos

>= 11.0 and < 11.0.1

💻

Apple

Watchos

< 5.3.9

💻

Apple

Watchos

>= 6.0 and < 6.2.9

💻

Apple

Watchos

>= 7.0 and < 7.1

References & Advisories

🔗 http://packetstormsecurity.com/files/161296/XNU-Kernel-Mach-Message-Trailers-Memory-Disclosure.html

🔗 http://seclists.org/fulldisclosure/2020/Dec/32

🔗 https://support.apple.com/en-us/HT211928

🔗 https://support.apple.com/en-us/HT211929

🔗 https://support.apple.com/en-us/HT211931

🔗 https://support.apple.com/en-us/HT211940

🔗 https://support.apple.com/en-us/HT211944

🔗 https://support.apple.com/en-us/HT211945

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