Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-21166

CVE-2021-21166HIGH

Google Chromium

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  U  H  H  H    8.8   .2403   97.8   YES

AFFECTED
  Product  Versions       Fixed
  Chrome   unspecified –  —

TIMELINE
  Dec 21  Reserved by Chrome
  Mar 9   Published (CNA: Chrome)
  Nov 3   Added to CISA KEV, remediation due 2021-11-17

CWE-362 · CNA: Chrome · CVSS v3.1 · 8 references · KEV due November 17, 2021

Description

Data race in audio in Google Chrome prior to 89.0.4389.72 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
March 9, 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-362

References (8)

https://chromereleases.googleblog.com/2021/03/stable-channel-update-for-desktop.html [x_refsource_MISC]
https://crbug.com/1177465 [x_refsource_MISC]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BBT54RKAE5XLMWSHLVUKJ7T2XHHYMXLH/ [vendor-advisory, x_refsource_FEDORA]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FE5SIKEVYTMDCC5OSXGOM2KRPYLHYMQX/ [vendor-advisory, x_refsource_FEDORA]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LCIDZ77XUDMB2EBPPWCQXPEIJERDNSNT/ [vendor-advisory, x_refsource_FEDORA]
https://security.gentoo.org/glsa/202104-08 [vendor-advisory, x_refsource_GENTOO]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21166 [government-resource]
https://www.debian.org/security/2021/dsa-4886 [vendor-advisory, x_refsource_DEBIAN]

Authoritative record: CVE-2021-21166 at cve.org

Vendors: google

Weaknesses: CWE-362

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-21166 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 Sunday, October 4, 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.