CVE-2021-21187: Debian Linux

Medium severity, CVSS 4.3. EPSS: 1.5% chance of exploitation in the next 30 days.

Insufficient data validation in URL formatting in Google Chrome prior to 89.0.4389.72 allowed a remote attacker to perform domain spoofing via IDN homographs via a crafted domain name.

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.