CVE-2025-43920

GNU Mailman 2.1.39, as bundled in cPanel (and WHM), in certain external archiver configurations, allows unauthenticated attackers to execute arbitrary OS commands via shell metacharacters in an email Subject line. NOTE: multiple third parties report that they are unable to reproduce this, regardless of whether cPanel or WHM is used.

Affected

GNU · Mailman

CVSS v3.1 NVD

8.1 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 MITRE

5.4 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

EPSS

0.59% chance of exploitation in the next 30 days, 47th percentile

Published

2025-04-20

Updated

2025-04-28

Proof-of-concept exploits (1)

• 0NYX-MY7H/CVE-2025-439201★ · 2025-04-20

Security advisories

• https://code.launchpad.net/~mailman-coders/mailman/2.1

References

• CVE Record
• NVD entry

Related

• CVE-2025-43919
• CVE-2025-43921