Reference page — cumulative record through Wednesday, October 7, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-30807

CVE-2021-30807HIGH

Apple Multiple Products

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   N   R  U  H  H  H    7.8   .2884   98.1   YES

AFFECTED
  Product  Versions       Fixed
  macOS    unspecified –  —
  macOS    unspecified –  —
  macOS    unspecified –  —

TIMELINE
  Apr 13  Reserved by apple
  Oct 19  Published (CNA: apple)
  Nov 3   Added to CISA KEV, remediation due 2021-11-17

CWE-787 · CNA: apple · CVSS v3.1 · 4 references · KEV due November 17, 2021

Description

A memory corruption issue was addressed with improved memory handling. This issue is fixed in macOS Big Sur 11.5.1, iOS 14.7.1 and iPadOS 14.7.1, watchOS 7.6.1. An application may be able to execute arbitrary code with kernel privileges. Apple is aware of a report that this issue may have been actively exploited.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
April 13, 2021	Reserved	Reserved by apple
October 19, 2021	Published	Published (CNA: apple)
November 3, 2021	KEV ADDED	Added to CISA KEV, remediation due 2021-11-17

Affected

Affected products and packages — 3 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Apple	macOS	—	unspecified	—
Apple	macOS	—	unspecified	—
Apple	macOS	—	unspecified	—

Weaknesses

CWE-787

References (4)

https://support.apple.com/en-us/HT212622 [x_refsource_MISC]
https://support.apple.com/en-us/HT212623 [x_refsource_MISC]
https://support.apple.com/en-us/HT212713 [x_refsource_MISC]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30807 [government-resource]

Authoritative record: CVE-2021-30807 at cve.org

Vendors: apple

Weaknesses: CWE-787

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-30807 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 Wednesday, October 7, 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.