What’s Vulnerable › Vulnerabilities

CVE-2025-43920

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-04-20 · updated 2026-06-17
• Weakness: CWE-78

Description

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 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-2025-43920
• https://github.com/cpanel/mailman2-python3
• https://www.openwall.com/lists/oss-security/2025/04/21/6

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