CVE-2021-42096

Publication date 21 October 2021

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

GNU Mailman before 2.1.35 may allow remote Privilege Escalation. A certain csrf_token value is derived from the admin password, and may be useful in conducting a brute-force attack against that password.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
mailman	20.04 LTS focal	Fixed 1:2.1.29-1ubuntu3.1
	18.04 LTS bionic	Fixed 1:2.1.26-1ubuntu0.4
	16.04 LTS xenial	Fixed 1:2.1.20-1ubuntu0.6+esm1

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
mailman	Upstream: https://bazaar.launchpad.net/~mailman-coders/mailman/2.1/revision/1873

Severity score breakdown

Parameter	Value
Base score	4.3 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N