Vulnerability in Redmine

CVE-2021-37156

Redmine 4.2.0 and 4.2.1 allow existing user sessions to continue upon enabling two-factor authentication for the user's account, but the intended behavior is for those sessions to be terminated.

Published 2021-08-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.010 (61.8th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 61.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: +0.000

Affected products

Redmine — versions 4.2.0, 4.2.1

Weakness classification (CWE)

CWE-613 — Insufficient Session Expiration

References

www.redmine.org/projects/redmine/wiki/Security_Advisories (Vendor Advisory)
www.redmine.org/news/132 (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2021-37156?: CVE-2021-37156 is a high-severity vulnerability in Redmine, classified under Insufficient Session Expiration. CVSS score: 7.5/10. Published 2021-08-05.
How severe is CVE-2021-37156?: High severity. CVSS v3 base score is 7.5 out of 10.