CVE-2025-43920

Public Exploit

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.

Category

5.4
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.21%
Third-Party Advisory github.com
Affected: GNU Mailman
Published at:
Updated at:

References

Link Tags
https://code.launchpad.net/~mailman-coders/mailman/2.1 product
https://github.com/0NYX-MY7H/CVE-2025-43920 third party advisory exploit
https://github.com/cpanel/mailman2-python3
https://www.openwall.com/lists/oss-security/2025/04/21/6

Frequently Asked Questions

What is the severity of CVE-2025-43920?
CVE-2025-43920 has been scored as a medium severity vulnerability.
How to fix CVE-2025-43920?
To fix CVE-2025-43920, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-43920 being actively exploited in the wild?
It is possible that CVE-2025-43920 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-43920?
CVE-2025-43920 affects GNU Mailman.
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