Homepage

Use After Free The advisory has been revoked - it doesn't affect any version of package gnome-shell-extension-disable-screenshield  (opens in a new tab)

Threat Intelligence

EPSS
2.92% (87th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-RHEL8-GNOMESHELLEXTENSIONDISABLESCREENSHIELD-1918775
  • published1 Sept 2021
  • disclosed28 Jul 2021
Report a new vulnerability Found a mistake?

Introduced: 28 Jul 2021

CVE-2021-21779  (opens in a new tab)
CWE-416  (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:8.

NVD Description

Note: Versions mentioned in the description apply only to the upstream gnome-shell-extension-disable-screenshield package and not the gnome-shell-extension-disable-screenshield package as distributed by RHEL.

A use-after-free vulnerability exists in the way Webkit’s GraphicsContext handles certain events in WebKitGTK 2.30.4. A specially crafted web page can lead to a potential information leak and further memory corruption. A victim must be tricked into visiting a malicious web page to trigger this vulnerability.

References