Reference page — cumulative record through Thursday, October 8, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-21220

CVE-2021-21220HIGH

Google Chromium V8

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  U  H  H  H    8.8   .7044   99.4   YES

AFFECTED
  Product  Versions       Fixed
  Chrome   unspecified –  —

TIMELINE
  Dec 21  Reserved by Chrome
  Apr 26  Published (CNA: Chrome)
  Nov 3   Added to CISA KEV, remediation due 2021-11-17

CWE-787 · CNA: Chrome · CVSS v3.1 · 9 references · KEV due November 17, 2021

Description

Insufficient validation of untrusted input in V8 in Google Chrome prior to 89.0.4389.128 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
December 21, 2020	Reserved	Reserved by Chrome
April 26, 2021	Published	Published (CNA: Chrome)
November 3, 2021	KEV ADDED	Added to CISA KEV, remediation due 2021-11-17

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Google	Chrome	—	unspecified	—

Weaknesses

CWE-787

References (9)

Authoritative record: CVE-2021-21220 at cve.org

Vendors: google

Weaknesses: CWE-787

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-21220 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 Thursday, October 8, 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.