Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2021-4126

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 32.7%
CVSS Severity
CVSS v3 Score 6.5
Products affected by CVE-2021-4126


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