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CVE-2021-21779

Published: 8 July 2021

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.

Notes

AuthorNote
jdstrand
webkit receives limited support. For details, see
https://wiki.ubuntu.com/SecurityTeam/FAQ#webkit
webkit in Ubuntu uses the JavaScriptCore (JSC) engine, not V8

Priority

Medium

Cvss 3 Severity Score

8.8

Score breakdown

Status

Package Release Status
qtwebkit-opensource-src
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Needs triage

lunar Needs triage

trusty Does not exist

upstream Needs triage

xenial Needs triage

groovy Ignored
(end of life)
hirsute Ignored
(end of life)
jammy Needs triage

impish Ignored
(end of life)
kinetic Ignored
(end of life, was needs-triage)
qtwebkit-source
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

lunar Does not exist

trusty Does not exist

upstream Needs triage

xenial Needs triage

jammy Does not exist

kinetic Does not exist

webkit2gtk
Launchpad, Ubuntu, Debian
impish
Released (2.32.3-1ubuntu1)
lunar
Released (2.32.3-1ubuntu1)
trusty Does not exist

upstream
Released (2.32.3)
xenial Deferred

groovy Ignored
(end of life)
bionic
Released (2.32.3-0ubuntu0.18.04.1)
focal
Released (2.32.3-0ubuntu0.20.04.1)
hirsute
Released (2.32.3-0ubuntu0.21.04.1)
jammy
Released (2.32.3-1ubuntu1)
kinetic
Released (2.32.3-1ubuntu1)
webkitgtk
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

lunar Does not exist

trusty Does not exist

upstream Needs triage

xenial Needs triage

jammy Does not exist

kinetic Does not exist

wpewebkit
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Needs triage

lunar Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

groovy Ignored
(end of life)
hirsute Ignored
(end of life)
jammy Needs triage

impish Ignored
(end of life)
kinetic Does not exist

Severity score breakdown

Parameter Value
Base score 8.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H