CVE-2021-30551

HIGH8.8

CISA KEV

Published 2021-06-15 · Updated 2026-06-17 · Source chrome-cve-admin@google.com

Summary

CVE-2021-30551 is a high-severity (CVSS 8.8) vulnerability in Google Chromium V8. CISA added it to the Known Exploited Vulnerabilities catalog on November 3, 2021, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by November 17, 2021. CISA does not currently list it as used in ransomware campaigns. Google has 75 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.

All 75 known-exploited Google vulnerabilities →

Description

Type confusion in V8 in Google Chrome prior to 91.0.4472.101 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-843CWE-843

CISA Known-Exploited Vulnerability

Product: Google — Chromium V8

Name: Google Chromium V8 Type Confusion Vulnerability

Date added: 2021-11-03 · Due: 2021-11-17

Required action: Apply updates per vendor instructions.

References

View on NVD

More exploited Google vulnerabilities

Most recently added to CISA KEV

CVE-2026-58704
Pixel — Google Pixel Improper Authorization Vulnerability
added 2026-09-16
CVE-2026-87491
Chromium V8 — Google Chromium V8 Out of Bounds Write Vulnerability
added 2026-09-09
CVE-2026-85046
Chromium V8 — Google Chromium V8 Type Confusion Vulnerability
added 2026-09-04
CVE-2026-11645
Chromium V8 — Google Chromium V8 Out-of-Bounds Read and Write Vulnerability
added 2026-06-09
CVE-2026-5281
Dawn — Google Dawn Use-After-Free Vulnerability
added 2026-04-01
CVE-2026-3910
Chromium V8 — Google Chromium V8 Improper Restriction of Operations Within the Bounds of a Memory Buffer Vulnerability
added 2026-03-13

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