What is CVE-2009-20001?

CVE-2009-20001 is a high-severity vulnerability in Mantisbt, classified under Insufficient Session Expiration. CVSS score: 8.1/10. Published 2021-03-07.

How severe is CVE-2009-20001?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Mantisbt

CVE-2009-20001

An issue was discovered in MantisBT before 2.24.5. It associates a unique cookie string with each user. This string is not reset upon logout (i.e., the user session is still considered valid and active), allowing an attacker who somehow gained access to a user's cookie to login as them.

Published 2021-03-07 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.009 (57.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Mantisbt

Weakness classification (CWE)

CWE-613 — Insufficient Session Expiration

References

mantisbt.org/bugs/view.php (Exploit, Issue Tracking, Vendor Advisory)
mantisbt.org/bugs/view.php (Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2009-20001?: CVE-2009-20001 is a high-severity vulnerability in Mantisbt, classified under Insufficient Session Expiration. CVSS score: 8.1/10. Published 2021-03-07.
How severe is CVE-2009-20001?: High severity. CVSS v3 base score is 8.1 out of 10.