What is CVE-2021-44227?

CVE-2021-44227 is a high-severity vulnerability in GNU Mailman, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2021-12-02.

How severe is CVE-2021-44227?

High severity. CVSS v3 base score is 8.8 out of 10.

CSRF in GNU Mailman

CVE-2021-44227

In GNU Mailman before 2.1.38, a list member or moderator can get a CSRF token and craft an admin request (using that token) to set a new admin password or make other changes.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2021-12-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (53.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.008 · change: +0.000

Affected products

GNU Mailman
Debian Linux — versions 9.0

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

bugs.launchpad.net/mailman/+bug/1952384 (Patch, Mailing List, Third Party Advisory, Issue Tracking)
lists.debian.org/debian-lts-announce/2022/06/msg00011.html (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2021-44227?: CVE-2021-44227 is a high-severity vulnerability in GNU Mailman, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2021-12-02.
How severe is CVE-2021-44227?: High severity. CVSS v3 base score is 8.8 out of 10.