CVE-2021-21220: Google Chromium V8 Improper Input Validation Vulnerability

High severity, CVSS 8.8. Actively exploited: in CISA KEV since 2021-11-03. EPSS: 70.4% chance of exploitation in the next 30 days.

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.

Affected products

• Fedoraproject Fedora: version 32 only; version 33 only; version 34 only
• Google Chrome: before 89.0.4389.128 (fixed in 89.0.4389.128)

Published 2021-04-26. Last modified 2026-06-17.