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Vulnerability record · CVE-2021-43331 · published 12 November 2021

CVE-2021-43331: Gnu mailman cross-site scripting vulnerability

Gnu · Mailman

In GNU Mailman before 2.1.36, a crafted URL to the Cgi/options.py user options page can execute arbitrary JavaScript for XSS.

6.1 CVSS 3.1 Medium EPSS 1.4% · top 29.0% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score, v2 4.3
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

In GNU Mailman before 2.1.36, a crafted URL to the Cgi/options.py user options page can execute arbitrary JavaScript for XSS.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugs.launchpad.net/mailman/+bug/1949401 Issue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/06/msg00011.html Mailing ListThird Party Advisory
https://mail.python.org/archives/list/mailman-announce%40python.org/message/I2X7PSFXIEPLM3UMKZMGOEO3UFYETGRL/
https://bugs.launchpad.net/mailman/+bug/1949401 Issue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/06/msg00011.html Mailing ListThird Party Advisory
https://mail.python.org/archives/list/mailman-announce%40python.org/message/I2X7PSFXIEPLM3UMKZMGOEO3UFYETGRL/

Track CVE-2021-43331 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-43331), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.