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Vulnerability record · CVE-2021-42096 · published 21 October 2021

CVE-2021-42096: Gnu mailman improper restriction of authentication attempts vulnerability

Gnu · Mailman

GNU Mailman before 2.1.35 may allow remote Privilege Escalation. A certain csrf_token value is derived from the admin password, and may be useful in conducting a brute-force attack against that password.

4.3 CVSS 3.1 Medium EPSS 1.3% · top 31.8% CWE-307 · Improper restriction of authentication attempts
4.3CVSS 3.1 base score, v2 4.0
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

GNU Mailman before 2.1.35 may allow remote Privilege Escalation. A certain csrf_token value is derived from the admin password, and may be useful in conducting a brute-force attack against that password.

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

Affected products

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

References

LinkTags
http://www.openwall.com/lists/oss-security/2021/10/21/4 Mailing ListPatchThird Party Advisory
https://bugs.launchpad.net/mailman/+bug/1947639 PatchThird Party Advisory
https://mail.python.org/archives/list/mailman-announce%40python.org/thread/IKCO6JU755AP5G5TKMBJL6IEZQTTNPDQ/
https://www.debian.org/security/2021/dsa-4991 Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/21/4 Mailing ListPatchThird Party Advisory
https://bugs.launchpad.net/mailman/+bug/1947639 PatchThird Party Advisory
https://mail.python.org/archives/list/mailman-announce%40python.org/thread/IKCO6JU755AP5G5TKMBJL6IEZQTTNPDQ/
https://www.debian.org/security/2021/dsa-4991 Third Party Advisory

Track CVE-2021-42096 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.

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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-2021-42096), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.