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CVE-2021-38502

Published: 3 November 2021

Thunderbird ignored the configuration to require STARTTLS security for an SMTP connection. A MITM could perform a downgrade attack to intercept transmitted messages, or could take control of the authenticated session to execute SMTP commands chosen by the MITM. If an unprotected authentication method was configured, the MITM could obtain the authentication credentials, too. This vulnerability affects Thunderbird < 91.2.

Priority

Medium

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package Release Status
thunderbird
Launchpad, Ubuntu, Debian
lunar
Released (1:91.3.1+build1-0ubuntu1)
bionic
Released (1:91.5.0+build1-0ubuntu0.18.04.1)
focal
Released (1:91.5.0+build1-0ubuntu0.20.04.1)
hirsute Ignored
(end of life)
impish
Released (1:91.3.1+build1-0ubuntu0.21.10.1)
trusty Ignored
(end of standard support)
upstream
Released (91.2)
jammy
Released (1:91.3.1+build1-0ubuntu1)
kinetic
Released (1:91.3.1+build1-0ubuntu1)
xenial Ignored
(end of standard support)

Severity score breakdown

Parameter Value
Base score 5.9
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N