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Use After Free Affecting firefox-esr package, versions <78.5.0esr-1

0.0
high

Snyk CVSS

    Attack Complexity Low
    User Interaction Required
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    EPSS 0.31% (70th percentile)
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NVD
8.8 high
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Red Hat
8.8 high
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SUSE
8.8 high

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  • Snyk ID SNYK-DEBIAN12-FIREFOXESR-1546117
  • published 18 Nov 2020
  • disclosed 9 Dec 2020
Report a new vulnerability Found a mistake?

Introduced: 18 Nov 2020

CVE-2020-26959 Open this link in a new tab
CWE-416 Open this link in a new tab

How to fix?

Upgrade Debian:12 firefox-esr to version 78.5.0esr-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream firefox-esr package and not the firefox-esr package as distributed by Debian. See How to fix? for Debian:12 relevant fixed versions and status.

During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.