What is CVE-2021-3992?

CVE-2021-3992 is a medium-severity vulnerability in Kevinpapst Kevinpapst/kimai2, classified under Improper Access Control. CVSS score: 6.5/10. Published 2021-12-01.

How severe is CVE-2021-3992?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Is CVE-2021-3992 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Kevinpapst Kevinpapst/kimai2

CVE-2021-3992

kimai2 is vulnerable to Improper Access Control

Published 2021-12-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.011 (63.5th percentile), scored 2026-10-04.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.5% 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: 0.011 · change: +0.000

Affected products

Kevinpapst Kevinpapst/kimai2 — versions unspecified
Kimai2 Project

Weakness classification (CWE)

Public proof-of-concept exploits

References

huntr.dev/bounties/a0c438fb-c8e1-40cf-acc6-c8a532b80b93 (Exploit, Patch, Third Party Advisory)
github.com/kevinpapst/kimai2/commit/ff9acab0fc81f0e9490462739ef15fe4ab028ea5 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-3992?: CVE-2021-3992 is a medium-severity vulnerability in Kevinpapst Kevinpapst/kimai2, classified under Improper Access Control. CVSS score: 6.5/10. Published 2021-12-01.
How severe is CVE-2021-3992?: Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2021-3992 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.