5.4
MEDIUM
CVE-2021-40347
Mailman Postorius Account Expositure and Unauthorized Unsubscribe Vulnerability
Description

An issue was discovered in views/list.py in GNU Mailman Postorius before 1.3.5. An attacker (logged into any account) can send a crafted POST request to unsubscribe any user from a mailing list, also revealing whether that address was subscribed in the first place.

INFO

Published Date :

Sept. 10, 2021, 7:15 p.m.

Last Modified :

Nov. 21, 2024, 6:23 a.m.

Remotely Exploitable :

Yes !

Impact Score :

2.5

Exploitability Score :

2.8
Affected Products

The following products are affected by CVE-2021-40347 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Postorius_project postorius
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-40347.

URL Resource
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=993746 Mailing List Third Party Advisory
https://gitlab.com/mailman/postorius/-/commit/3d880c56b58bc26b32eac0799407d74b64b7474b Patch Third Party Advisory
https://gitlab.com/mailman/postorius/-/issues/531 Exploit Issue Tracking Patch Third Party Advisory
https://gitlab.com/mailman/postorius/-/tags Third Party Advisory
https://phabricator.wikimedia.org/T289798 Exploit Patch Third Party Advisory
https://www.debian.org/security/2021/dsa-4970 Third Party Advisory
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=993746 Mailing List Third Party Advisory
https://gitlab.com/mailman/postorius/-/commit/3d880c56b58bc26b32eac0799407d74b64b7474b Patch Third Party Advisory
https://gitlab.com/mailman/postorius/-/issues/531 Exploit Issue Tracking Patch Third Party Advisory
https://gitlab.com/mailman/postorius/-/tags Third Party Advisory
https://phabricator.wikimedia.org/T289798 Exploit Patch Third Party Advisory
https://www.debian.org/security/2021/dsa-4970 Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-40347 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-40347 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=993746
    Added Reference https://gitlab.com/mailman/postorius/-/commit/3d880c56b58bc26b32eac0799407d74b64b7474b
    Added Reference https://gitlab.com/mailman/postorius/-/issues/531
    Added Reference https://gitlab.com/mailman/postorius/-/tags
    Added Reference https://phabricator.wikimedia.org/T289798
    Added Reference https://www.debian.org/security/2021/dsa-4970
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Initial Analysis by [email protected]

    Sep. 24, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:S/C:P/I:P/A:N)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
    Changed Reference Type https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=993746 No Types Assigned https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=993746 Mailing List, Third Party Advisory
    Changed Reference Type https://gitlab.com/mailman/postorius/-/commit/3d880c56b58bc26b32eac0799407d74b64b7474b No Types Assigned https://gitlab.com/mailman/postorius/-/commit/3d880c56b58bc26b32eac0799407d74b64b7474b Patch, Third Party Advisory
    Changed Reference Type https://gitlab.com/mailman/postorius/-/issues/531 No Types Assigned https://gitlab.com/mailman/postorius/-/issues/531 Exploit, Issue Tracking, Patch, Third Party Advisory
    Changed Reference Type https://gitlab.com/mailman/postorius/-/tags No Types Assigned https://gitlab.com/mailman/postorius/-/tags Third Party Advisory
    Changed Reference Type https://phabricator.wikimedia.org/T289798 No Types Assigned https://phabricator.wikimedia.org/T289798 Exploit, Patch, Third Party Advisory
    Changed Reference Type https://www.debian.org/security/2021/dsa-4970 No Types Assigned https://www.debian.org/security/2021/dsa-4970 Third Party Advisory
    Added CWE NIST NVD-CWE-noinfo
    Added CPE Configuration OR *cpe:2.3:a:postorius_project:postorius:*:*:*:*:*:*:*:* versions up to (excluding) 1.3.5
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-40347 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-40347 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.21 }} -0.41%

score

0.44101

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
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Latest DB Update: Jul. 21, 2025 18:09