CVE-2021-42097

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 csrf_token value is not specific to a single user account. An attacker can obtain a value within the context of an unprivileged user account, and then use that value in a CSRF attack against an admin (e.g., for account takeover).

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	8.0 · High
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H