VDB-305746 · CVE-2025-43921 · EUVD-2025-12590

GNU Mailman 2.1.39 List /mailman/create authorization

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.3	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic was found in GNU Mailman 2.1.39. Affected by this issue is some unknown functionality of the file /mailman/create of the component List Handler. Executing a manipulation can lead to authorization. This vulnerability is handled as CVE-2025-43921. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in GNU Mailman 2.1.39. It has been declared as problematic. This vulnerability affects an unknown function of the file /mailman/create of the component List Handler. The manipulation with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. As an impact it is known to affect integrity. CVE summarizes:

GNU Mailman 2.1.39, as bundled in cPanel (and WHM), allows unauthenticated attackers to create lists via the /mailman/create endpoint.

The advisory is available at code.launchpad.net. This vulnerability was named CVE-2025-43921 since 04/19/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/13/2025).

The vulnerability scanner Nessus provides a plugin with the ID 264322 (Linux Distros Unpatched Vulnerability : CVE-2025-43921), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (264322) and EUVD (EUVD-2025-12590). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Mail Client Software

Vendor

Name

Mailman

Version

2.1.39

License

open-source

Website

Vendor: https://www.gnu.org/

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.3
NVD Vector: 🔍

CNA Base Score: 5.3
CNA Vector (MITRE): 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Authorization
CWE: CWE-863 / CWE-285 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 264322
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-43921

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

04/19/2025 🔍
04/20/2025 +1 days 🔍
04/20/2025 +0 days 🔍
09/13/2025 +146 days 🔍

Sourcesinfo

Vendor: gnu.org

Advisory: code.launchpad.net
Status: Confirmed

CVE: CVE-2025-43921 (🔍)
GCVE (CVE): GCVE-0-2025-43921
GCVE (VulDB): GCVE-100-305746
EUVD: 🔍

Entryinfo

Created: 04/20/2025 12:16
Updated: 09/13/2025 02:26
Changes: 04/20/2025 12:16 (63), 04/28/2025 17:13 (10), 05/25/2025 23:03 (1), 09/13/2025 02:26 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.