CVE-2021-21806: WebKitGTK

High severity, CVSS 8.8. EPSS: 2.8% chance of exploitation in the next 30 days.

An exploitable use-after-free vulnerability exists in WebKitGTK browser version 2.30.3 x64. A specially crafted HTML web page can cause a use-after-free condition, resulting in remote code execution. The victim needs to visit a malicious web site to trigger the vulnerability.

Affected products

• WebKitGTK WebKitGTK: version 2.30.3 only

Published 2021-07-08. Last modified 2026-06-17.