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.
History

Wed, 16 Apr 2025 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2025-04-16T15:51:48.700Z

Reserved: 2021-12-16T00:00:00.000Z

Link: CVE-2021-4126

cve-icon Vulnrichment

Updated: 2024-08-03T17:16:04.116Z

cve-icon NVD

Status : Modified

Published: 2022-12-22T20:15:11.647

Modified: 2025-04-16T16:15:18.487

Link: CVE-2021-4126

cve-icon Redhat

No data.