CVE-2021-37973: Google Chromium Portals Use-After-Free Vulnerability

Critical severity, CVSS 9.6. Actively exploited: in CISA KEV since 2021-11-03. EPSS: 11.7% chance of exploitation in the next 30 days.

Use after free in Portals in Google Chrome prior to 94.0.4606.61 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page.

Affected products

• Debian Debian Linux: version 10.0 only; version 11.0 only
• Fedoraproject Fedora: version 33 only; version 35 only
• Google Chrome: before 94.0.4606.61 (fixed in 94.0.4606.61)

Published 2021-10-08. Last modified 2026-06-17.