Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-30663

CVE-2021-30663HIGH

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   .0352   89.1   YES

AFFECTED
  Product  Versions       Fixed
  macOS    unspecified –  —
  macOS    unspecified –  —
  macOS    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-190 · CNA: apple · CVSS v3.1 · 6 references · KEV due November 17, 2021

Description

An integer overflow was addressed with improved input validation. This issue is fixed in iOS 14.5.1 and iPadOS 14.5.1, tvOS 14.6, iOS 12.5.3, Safari 14.1.1, macOS Big Sur 11.3.1. Processing maliciously crafted web content may lead to arbitrary code execution.

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 — 5 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Apple	macOS	—	unspecified	—
Apple	macOS	—	unspecified	—
Apple	macOS	—	unspecified	—
Apple	macOS	—	unspecified	—
Apple	macOS	—	unspecified	—

Weaknesses

CWE-190

References (6)

https://support.apple.com/en-us/HT212335 [x_refsource_MISC]
https://support.apple.com/en-us/HT212336 [x_refsource_MISC]
https://support.apple.com/en-us/HT212341 [x_refsource_MISC]
https://support.apple.com/en-us/HT212532 [x_refsource_MISC]
https://support.apple.com/en-us/HT212534 [x_refsource_MISC]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30663 [government-resource]

Authoritative record: CVE-2021-30663 at cve.org

Vendors: apple

Weaknesses: CWE-190

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-30663 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 19, 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.