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CVE-2021-43529

Published: 16 February 2023

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.

Priority

Medium

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package Release Status
thunderbird
Launchpad, Ubuntu, Debian
bionic
Released (1:91.5.0+build1-0ubuntu0.18.04.1)
focal
Released (1:91.5.0+build1-0ubuntu0.20.04.1)
impish Not vulnerable
(1:91.3.1+build1-0ubuntu0.21.10.2)
kinetic Not vulnerable

lunar Not vulnerable

trusty Ignored
(end of standard support)
upstream
Released (1:91.3.0-1)
xenial Ignored
(end of standard support)
hirsute Ignored
(end of life)
jammy Not vulnerable

Severity score breakdown

Parameter Value
Base score 9.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H