Reference page — cumulative record through Monday, October 5, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2020-27950

CVE-2020-27950MEDIUM

Apple Multiple Products

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   N   R  U  H  N  N    5.5   .1652   96.9   YES

AFFECTED
  Product         Versions       Fixed
  watchOS         unspecified –  —
  iOS and iPadOS  unspecified –  —
  macOS           unspecified –  —
  macOS           unspecified –  —
  macOS           unspecified –  —
  macOS           unspecified –  —
  macOS           unspecified –  —
  macOS           unspecified –  —

TIMELINE
  Oct 27  Reserved by apple
  Dec 8   Published (CNA: apple)
  Nov 3   Added to CISA KEV, remediation due 2022-05-03

CWE-665 · CNA: apple · CVSS v3.1 · 11 references · KEV due May 3, 2022

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
October 27, 2020	Reserved	Reserved by apple
December 8, 2020	Published	Published (CNA: apple)
November 3, 2021	KEV ADDED	Added to CISA KEV, remediation due 2022-05-03

Affected

Affected products and packages — 8 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Apple	watchOS	—	unspecified	—
Apple	iOS and iPadOS	—	unspecified	—
Apple	macOS	—	unspecified	—
Apple	macOS	—	unspecified	—
Apple	macOS	—	unspecified	—
Apple	macOS	—	unspecified	—
Apple	macOS	—	unspecified	—
Apple	macOS	—	unspecified	—

Weaknesses

CWE-665

References (11)

http://packetstormsecurity.com/files/161296/XNU-Kernel-Mach-Message-Trailers-Memory-Disclosure.html [x_refsource_MISC]
http://seclists.org/fulldisclosure/2020/Dec/32 [mailing-list, x_refsource_FULLDISC]
https://support.apple.com/en-us/HT211928 [x_refsource_MISC]
https://support.apple.com/en-us/HT211929 [x_refsource_MISC]
https://support.apple.com/en-us/HT211931 [x_refsource_MISC]
https://support.apple.com/en-us/HT211940 [x_refsource_MISC]
https://support.apple.com/en-us/HT211944 [x_refsource_MISC]
https://support.apple.com/en-us/HT211945 [x_refsource_MISC]
https://support.apple.com/en-us/HT211946 [x_refsource_MISC]
https://support.apple.com/en-us/HT211947 [x_refsource_MISC]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-27950 [government-resource]

Authoritative record: CVE-2020-27950 at cve.org

Vendors: apple

Weaknesses: CWE-665

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2020-27950 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 5, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.