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-2021-1879

CVE-2021-1879MEDIUM

Apple iOS, iPadOS, and watchOS

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  C  L  L  N    6.1   .0708   94.1   YES

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

TIMELINE
  Dec 8   Reserved by apple
  Apr 2   Published (CNA: apple)
  Nov 3   Added to CISA KEV, remediation due 2021-11-17

CWE-79 · CNA: apple · CVSS v3.1 · 4 references · KEV due November 17, 2021

Description

This issue was addressed by improved management of object lifetimes. This issue is fixed in iOS 12.5.2, iOS 14.4.2 and iPadOS 14.4.2, watchOS 7.3.3. Processing maliciously crafted web content may lead to universal cross site scripting. Apple is aware of a report that this issue may have been actively exploited..

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
December 8, 2020	Reserved	Reserved by apple
April 2, 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	iOS and iPadOS	—	unspecified	—
Apple	iOS	—	unspecified	—
Apple	watchOS	—	unspecified	—

Weaknesses

CWE-79

References (4)

https://support.apple.com/en-us/HT212256 [x_refsource_MISC]
https://support.apple.com/en-us/HT212257 [x_refsource_MISC]
https://support.apple.com/en-us/HT212258 [x_refsource_MISC]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1879 [government-resource]

Authoritative record: CVE-2021-1879 at cve.org

Vendors: apple

Weaknesses: CWE-79

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-1879 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.