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CVE-2021-23991

Published: 13 April 2021

If a Thunderbird user has previously imported Alice's OpenPGP key, and Alice has extended the validity period of her key, but Alice's updated key has not yet been imported, an attacker may send an email containing a crafted version of Alice's key with an invalid subkey, Thunderbird might subsequently attempt to use the invalid subkey, and will fail to send encrypted email to Alice. This vulnerability affects Thunderbird < 78.9.1.

Priority

Medium

Cvss 3 Severity Score

6.8

Score breakdown

Status

Package Release Status
thunderbird
Launchpad, Ubuntu, Debian
jammy
Released (1:78.11.0+build1-0ubuntu2)
kinetic
Released (1:78.11.0+build1-0ubuntu2)
lunar
Released (1:78.11.0+build1-0ubuntu2)
impish
Released (1:78.11.0+build1-0ubuntu2)
bionic
Released (1:78.11.0+build1-0ubuntu0.18.04.2)
focal
Released (1:78.11.0+build1-0ubuntu0.20.04.2)
groovy
Released (1:78.11.0+build1-0ubuntu0.20.10.2)
hirsute
Released (1:78.11.0+build1-0ubuntu0.21.04.2)
trusty Does not exist

upstream
Released (78.9.1)
xenial Ignored
(end of standard support, was needs-triage)

Severity score breakdown

Parameter Value
Base score 6.8
Attack vector Network
Attack complexity High
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N