CVE-2021-4126 Affecting thunderbird package, versions <91.4.1-r0


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.08% (36th percentile)

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  • Snyk IDSNYK-ALPINE321-THUNDERBIRD-8489610
  • published6 Dec 2024
  • disclosed22 Dec 2022

Introduced: 22 Dec 2022

CVE-2021-4126  (opens in a new tab)

How to fix?

Upgrade Alpine:3.21 thunderbird to version 91.4.1-r0 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 Alpine. See How to fix? for Alpine:3.21 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.

CVSS Scores

version 3.1