PT-2025-17399 · Unknown · Gnu Mailman

Firudin Davudzada + 1 · Published 2025-04-19 · Updated 2025-04-21 · CVE-2025-43921

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions GNU Mailman version 2.1.39

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

Recommendations For GNU Mailman version 2.1.39, consider disabling access to the "/mailman/create" endpoint until a patch is available. Restricting access to this endpoint can help minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Incorrect Authorization

Weakness Enumeration

CWE-863

Related Identifiers

BDU:2026-00164

CVE-2025-43921

Affected Products

Gnu Mailman

References · 16

• 🔥 https://github.com/0NYX-MY7H/CVE-2025-43921 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2025-43921 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-43921 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-43921 · Security Note
• https://ubuntu.com/security/CVE-2025-43921 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-43921 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-00164 · Security Note
• https://github.com/cpanel/mailman2-python3 · Note
• https://t.me/cvedetector/23402 · Telegram Post
• https://openwall.com/lists/oss-security/2025/04/21/6 · Note
• https://twitter.com/CVEnew/status/1913823703437119875 · Twitter Post
• https://twitter.com/oss_security/status/1914366528763371589 · Twitter Post
• https://t.me/cvenotify/119058 · Telegram Post
• https://t.me/cvetracker/22013 · Telegram Post
• https://code.launchpad.net/~mailman-coders/mailman/2.1 · Note