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Vulnerability record · CVE-2021-34337 · published 15 April 2023

CVE-2021-34337: Gnu mailman vulnerability

Gnu · Mailman

An issue was discovered in Mailman Core before 3.3.5. An attacker with access to the REST API could use timing attacks to determine the value of the configured REST API password and then make arbitrary REST API calls. The REST API is bound to localhost by default, limiting the ability for attackers to exploit this, but can optionally be made to listen on other interfaces.

6.3 CVSS 3.1 Medium EPSS 0.30% · top 79.4% CWE-208 · CWE-208
6.3CVSS 3.1 base score
0.30%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in Mailman Core before 3.3.5. An attacker with access to the REST API could use timing attacks to determine the value of the configured REST API password and then make arbitrary REST API calls. The REST API is bound to localhost by default, limiting the ability for attackers to exploit this, but can optionally be made to listen on other interfaces.

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

Affected products

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

References

LinkTags
https://gitlab.com/mailman/mailman/-/commit/e4a39488c4510fcad8851217f10e7337a196bb51 PatchVendor Advisory
https://gitlab.com/mailman/mailman/-/issues/911 Broken Link
https://gitlab.com/mailman/mailman/-/tags Release Notes
https://gitlab.com/mailman/mailman/-/commit/e4a39488c4510fcad8851217f10e7337a196bb51 PatchVendor Advisory
https://gitlab.com/mailman/mailman/-/issues/911 Broken Link
https://gitlab.com/mailman/mailman/-/tags Release Notes

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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-2021-34337), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.