high
8.8
CWE
416
Advisory Published
CVE Published
Updated

CVE-2021-21779: Use After Free

First published: Mon May 24 2021(Updated: )

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.

Credit: Marcin Towalski Cisco TalosMarcin Towalski Cisco TalosMarcin Towalski Cisco TalosMarcin Towalski Cisco TalosMarcin Towalski Cisco Talos talos-cna@cisco.com

Affected SoftwareAffected VersionHow to fix
debian/webkit2gtk
2.36.4-1~deb10u1
2.38.6-0+deb10u1
2.40.5-1~deb11u1
2.42.1-1~deb11u2
2.40.5-1~deb12u1
2.42.1-1~deb12u1
2.42.1-2
debian/wpewebkit
2.38.6-1~deb11u1
2.38.6-1
2.42.1-1
WebKitGTK WebKitGTK=2.30.4
Fedoraproject Fedora=33
Fedoraproject Fedora=34
Debian Debian Linux=10.0
Apple watchOS<7.5
7.5
Apple macOS Big Sur<11.4
11.4
Apple iOS<14.6
14.6
Apple iPadOS<14.6
14.6
Apple tvOS<14.6
14.6
Apple Safari<14.1.1
14.1.1

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is CVE-2021-21779?

    CVE-2021-21779 is a vulnerability in WebKit that allows for a use after free issue due to a memory management flaw.

  • What software is affected by CVE-2021-21779?

    CVE-2021-21779 affects Apple tvOS versions up to and exclusive of 14.6, Apple watchOS versions up to and exclusive of 7.5, Apple Safari versions up to and exclusive of 14.1.1, Apple macOS Big Sur versions up to and exclusive of 11.4, Apple iOS versions up to and exclusive of 14.6, and Apple iPadOS versions up to and exclusive of 14.6.

  • How can the use after free issue in CVE-2021-21779 be fixed?

    To fix the use after free issue in CVE-2021-21779, update to the latest version of the affected software.

  • Where can I find more information about CVE-2021-21779?

    More information about CVE-2021-21779 can be found on the Apple support website at the following links: [link1], [link2], [link3].

  • What is CWE-416?

    CWE-416 is a common weakness enumeration reference for use after free vulnerabilities.

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