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-2021-30661

CVE-2021-30661HIGH

Apple Multiple Products

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  U  H  H  H    8.8   .0449   91.2   YES

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

TIMELINE
  Apr 13  Reserved by apple
  Sep 8   Published (CNA: apple)
  Nov 3   Added to CISA KEV, remediation due 2021-11-17

CWE-416 · CNA: apple · CVSS v3.1 · 7 references · KEV due November 17, 2021

Description

A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.1, iOS 12.5.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3. Processing maliciously crafted web content may lead to arbitrary code execution. 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
September 8, 2021	Published	Published (CNA: apple)
November 3, 2021	KEV ADDED	Added to CISA KEV, remediation due 2021-11-17

Affected

Affected products and packages — 6 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Apple	iOS and iPadOS	—	unspecified	—
Apple	Safari	—	unspecified	—
Apple	tvOS	—	unspecified	—
Apple	watchOS	—	unspecified	—
Apple	macOS	—	unspecified	—
Apple	macOS	—	unspecified	—

Weaknesses

CWE-416

References (7)

https://support.apple.com/en-us/HT212317 [x_refsource_MISC]
https://support.apple.com/en-us/HT212318 [x_refsource_MISC]
https://support.apple.com/en-us/HT212323 [x_refsource_MISC]
https://support.apple.com/en-us/HT212324 [x_refsource_MISC]
https://support.apple.com/en-us/HT212325 [x_refsource_MISC]
https://support.apple.com/en-us/HT212341 [x_refsource_MISC]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30661 [government-resource]

Authoritative record: CVE-2021-30661 at cve.org

Vendors: apple

Weaknesses: CWE-416

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-30661 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.