What’s Vulnerable › Vulnerabilities

CVE-2025-43921

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-04-20 · updated 2026-06-17
• Weakness: CWE-863

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.

Affected products

• GNU Mailman: from 2.1.1 through 2.1.39

References

• https://code.launchpad.net/~mailman-coders/mailman/2.1
• https://github.com/0NYX-MY7H/CVE-2025-43921
• https://github.com/cpanel/mailman2-python3
• https://www.openwall.com/lists/oss-security/2025/04/21/6

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