CVE-2021-21193
Published 2021-03-16 · Updated 2026-06-17 · Source chrome-cve-admin@google.com
Summary
CVE-2021-21193 is a high-severity (CVSS 8.8) vulnerability in Google Chromium Blink. 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 76 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.
All 76 known-exploited Google vulnerabilities →Description
Use after free in Blink in Google Chrome prior to 89.0.4389.90 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
CISA Known-Exploited Vulnerability
Product: Google — Chromium Blink
Name: Google Chromium Blink Use-After-Free Vulnerability
Date added: 2021-11-03 · Due: 2021-11-17
Required action: Apply updates per vendor instructions.
References
- https://chromereleases.googleblog.com/2021/03/stable-channel-update-for-desktop_12.html
- https://crbug.com/1186287
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/N52OWF4BAP3JNK2QYGU3Q6QUVDZDCIMQ/
- https://security.gentoo.org/glsa/202104-08
- https://www.debian.org/security/2021/dsa-4886
- https://chromereleases.googleblog.com/2021/03/stable-channel-update-for-desktop_12.html
- https://crbug.com/1186287
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/N52OWF4BAP3JNK2QYGU3Q6QUVDZDCIMQ/