How to fix CVE-2025-43919?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Is Mailman affected by CVE-2025-43919?

CVE-2025-43919 presents moderate security risk rated CVSS 5.8. Exploitation could compromise the security of affected deployments. Proof-of-concept code is publicly available. Organizations should apply vendor updates when available and monitor for exploitation.

CVE-2025-43919

MEDIUM

2025-04-20 [email protected]

5.8

CVSS 3.1

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

None

Availability

None

Lifecycle Timeline

Patch Released

Apr 06, 2026 - 08:30 nvd

Patch available

Analysis Generated

Mar 28, 2026 - 18:37 vuln.today

PoC Detected

Apr 28, 2025 - 14:15 vuln.today

Public exploit code

CVE Published

Apr 20, 2025 - 01:15 nvd

MEDIUM 5.8

Description

GNU Mailman 2.1.39, as bundled in cPanel (and WHM), allows unauthenticated attackers to read arbitrary files via ../ directory traversal at /mailman/private/mailman (aka the private archive authentication endpoint) via the username parameter. NOTE: multiple third parties report that they are unable to reproduce this, regardless of whether cPanel or WHM is used.

Analysis

GNU Mailman 2.1.39, as bundled in cPanel (and WHM), allows unauthenticated attackers to read arbitrary files via ../ directory traversal at /mailman/private/mailman (aka the private archive. Rated medium severity (CVSS 5.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical Context

This vulnerability is classified under CWE-24. GNU Mailman 2.1.39, as bundled in cPanel (and WHM), allows unauthenticated attackers to read arbitrary files via ../ directory traversal at /mailman/private/mailman (aka the private archive authentication endpoint) via the username parameter. NOTE: multiple third parties report that they are unable to reproduce this, regardless of whether cPanel or WHM is used. Affected products include: Gnu Mailman.

Affected Products

Gnu Mailman.

Remediation

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.2

CVSS: +29

POC: +20

Vendor Status

CVE-2025-43919 vulnerability details – vuln.today

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CVE-2025-43919

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CVE-2025-43919

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Description

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External POC / Exploit Code