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CVE-2021-23993

Published: 13 April 2021

An attacker may perform a DoS attack to prevent a user from sending encrypted email to a correspondent. If an attacker creates a crafted OpenPGP key with a subkey that has an invalid self signature, and the Thunderbird user imports the crafted key, then Thunderbird may try to use the invalid subkey, but the RNP library rejects it from being used, causing encryption to fail. This vulnerability affects Thunderbird < 78.9.1.

Priority

Medium

CVSS 3 base score: 6.5

Status

Package Release Status
thunderbird
Launchpad, Ubuntu, Debian
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)
impish
Released (1:78.11.0+build1-0ubuntu2)
jammy
Released (1:78.11.0+build1-0ubuntu2)
precise Does not exist

trusty Does not exist

upstream
Released (78.9.1)
xenial Needs triage