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CVE-2021-4126

MEDIUM

6.5

Description

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.

CVE Details

CVSS v3.1 Score6.5

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionREQUIRED

Published12/22/2022

Last Modified4/16/2025

Sourcenvd

Honeypot Sightings0

Affected Products

mozilla:thunderbird

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1732310(security@mozilla.org)

https://www.mozilla.org/security/advisories/mfsa2021-55/(security@mozilla.org)

https://bugzilla.mozilla.org/show_bug.cgi?id=1732310(af854a3a-2127-422b-91ae-364da2661108)

https://www.mozilla.org/security/advisories/mfsa2021-55/(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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