GNU Mailman Vulnerability in cPanel Allows List Creation by Unauthenticated Attackers
CVE-2025-43921

5.3MEDIUM

Key Information:

Vendor
Gnu
Status
Mailman
Vendor
CVE Published:
20 April 2025

Badges

👾 Exploit Exists🟡 Public PoC

Summary

The vulnerability in GNU Mailman version 2.1.39, as packaged with cPanel, exposes an endpoint that allows unauthenticated attackers to create email distribution lists. This poses significant security risks, as it could be exploited to spread spam or malicious content, affecting the integrity and reputation of affected services. Administrators are urged to secure this endpoint to prevent unauthorized list creation.

Affected Version(s)

Mailman 2.1.39

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-43921
Created by 0NYX-MY7H

References

https://code.launchpad.net/~mailman-coders/mailman/2.1
https://github.com/0NYX-MY7H/CVE-2025-43921

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

.