CVE-2020-15685

Publication date 31 December 2020

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

During the plaintext phase of the STARTTLS connection setup, protocol commands could have been injected and evaluated within the encrypted session. This vulnerability affects Thunderbird < 78.7.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
thunderbird	23.04 lunar	Fixed 1:78.7.0+build2-0ubuntu1
	22.10 kinetic	Fixed 1:78.7.0+build2-0ubuntu1
	22.04 LTS jammy	Fixed 1:78.7.0+build2-0ubuntu1
	21.10 impish	Fixed 1:78.7.0+build2-0ubuntu1
	21.04 hirsute	Fixed 1:78.7.0+build2-0ubuntu1
	20.10 groovy	Fixed 1:78.7.1+build1-0ubuntu0.20.10.4
	20.04 LTS focal	Fixed 1:78.7.1+build1-0ubuntu0.20.04.1
	18.04 LTS bionic	Fixed 1:78.8.1+build1-0ubuntu0.18.04.1
	16.04 LTS xenial	Ignored end of standard support, was needed
	14.04 LTS trusty	Not in release

Severity score breakdown

Parameter	Value
Base score	8.8 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-4736-1
Thunderbird vulnerabilities
16 February 2021