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CVE-2021-43529

CRITICAL CVSS: 9.8 Published: 2023-02-16 Modified: 2026-06-17

Description

Thunderbird versions prior to 91.3.0 are vulnerable to the heap overflow described in CVE-2021-43527 when processing S/MIME messages. Thunderbird versions 91.3.0 and later will not call the vulnerable code when processing S/MIME messages that contain certificates with DER-encoded DSA or RSA-PSS signatures.

Affected Platforms

Mozilla Thunderbird

Weakness Type

CWE-787, CWE-787

References