Exploited
8.1
CWE
362 416
Advisory Published
CVE Published
Updated

CVE-2020-6820: Mozilla Firefox And Thunderbird Use-After-Free Vulnerability

First published: Fri Apr 03 2020(Updated: )

Last updated 21 August 2024

Credit: security@mozilla.org security@mozilla.org

Affected SoftwareAffected VersionHow to fix
Mozilla Thunderbird<68.7
68.7
Mozilla Firefox<74.0.1
74.0.1
Mozilla Firefox ESR<68.6.1
68.6.1
Mozilla Firefox<74.0.1
Mozilla Firefox ESR<68.6.1
Mozilla Thunderbird<68.7.0
Mozilla Firefox and Thunderbird
debian/firefox
132.0.2-1
debian/firefox-esr
115.14.0esr-1~deb11u1
128.4.0esr-1~deb11u1
128.3.1esr-1~deb12u1
128.4.0esr-1~deb12u1
128.4.0esr-1
debian/thunderbird
1:115.12.0-1~deb11u1
1:128.4.3esr-1~deb11u1
1:115.16.0esr-1~deb12u1
1:128.4.3esr-1~deb12u1
1:128.4.3esr-1

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Parent vulnerabilities

(Appears in the following advisories)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is CVE-2020-6820?

    CVE-2020-6820 is a use-after-free vulnerability in Mozilla Firefox and Thunderbird.

  • Which software is affected by CVE-2020-6820?

    Mozilla Firefox < 74.0.1, Firefox ESR < 68.6.1, and Thunderbird < 68.7.0 are affected.

  • How severe is CVE-2020-6820?

    CVE-2020-6820 has a severity rating of 8.1 (critical).

  • How do I fix CVE-2020-6820 in Mozilla Firefox?

    Update Mozilla Firefox to version 74.0.1 or higher to fix CVE-2020-6820.

  • How do I fix CVE-2020-6820 in Thunderbird?

    Upgrade Thunderbird to version 68.7.0 or higher to fix CVE-2020-6820.

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