CVE-2021-21166: Google Chromium Race Condition Vulnerability

High severity, CVSS 8.8. Actively exploited: in CISA KEV since 2021-11-03. EPSS: 24% chance of exploitation in the next 30 days.

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.

Affected products

• Debian Debian Linux: version 10.0 only
• Fedoraproject Fedora: version 32 only; version 33 only; version 34 only
• Google Chrome: before 89.0.4389.72 (fixed in 89.0.4389.72)

Published 2021-03-09. Last modified 2026-06-17.