Medium severity · published Apr 20, 2025
CVE-2025-43921
GNU Mailman 2.1.39, as bundled in cPanel (and WHM), allows unauthenticated attackers to create lists via the /mailman/create endpoint
5.3
CVSS
0.5%
EPSS
No
On KEV
Description
GNU Mailman 2.1.39, as bundled in cPanel (and WHM), allows unauthenticated attackers to create lists via the /mailman/create endpoint. NOTE: multiple third parties report that they are unable to reproduce this, regardless of whether cPanel or WHM is used.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
Mailman · Gnu
2.1.1 through 2.1.39 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-43921
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-43921
Product
https://code.launchpad.net/~mailman-coders/mailman/2.1
Exploit
https://github.com/0NYX-MY7H/CVE-2025-43921
github.com
https://github.com/cpanel/mailman2-python3
www.openwall.com
https://www.openwall.com/lists/oss-security/2025/04/21/6
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