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CVE-2021-4126 Affecting thunderbird package, versions <1:91.4.1-1

0.0
medium

Snyk CVSS

    Attack Complexity Low
    User Interaction Required
    Integrity High

    Threat Intelligence

    EPSS 0.07% (30th percentile)
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NVD
6.5 medium
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SUSE
5.3 medium

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  • Snyk ID SNYK-DEBIANUNSTABLE-THUNDERBIRD-2322094
  • published 21 Dec 2021
  • disclosed 22 Dec 2022
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Introduced: 21 Dec 2021

CVE-2021-4126 Open this link in a new tab

How to fix?

Upgrade Debian:unstable thunderbird to version 1:91.4.1-1 or higher.

NVD Description

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

When receiving an OpenPGP/MIME signed email message that contains an additional outer MIME message layer, for example a message footer added by a mailing list gateway, Thunderbird only considered the inner signed message for the signature validity. This gave the false impression that the additional contents were also covered by the digital signature. Starting with Thunderbird version 91.4.1, only the signature that belongs to the top level MIME part will be considered for the displayed status. This vulnerability affects Thunderbird < 91.4.1.