What is CVE-2023-2020?

CVE-2023-2020 is a medium-severity vulnerability in Checkmk, classified under Improper Handling of Insufficient Permissions or Privileges. CVSS score: 4.3/10. Published 2023-04-18.

How severe is CVE-2023-2020?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Checkmk

CVE-2023-2020

Insufficient permission checks in the REST API in Tribe29 Checkmk <= 2.1.0p27 and <= 2.2.0b4 (beta) allow unauthorized users to schedule downtimes for any host.

Published 2023-04-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (32.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Checkmk — versions 2.1.0, 2.2.0
Tribe29 Checkmk — versions 2.2.0, 2.1.0

Weakness classification (CWE)

References

checkmk.com/werk/13981 (Vendor Advisory)

Frequently asked questions

What is CVE-2023-2020?: CVE-2023-2020 is a medium-severity vulnerability in Checkmk, classified under Improper Handling of Insufficient Permissions or Privileges. CVSS score: 4.3/10. Published 2023-04-18.
How severe is CVE-2023-2020?: Medium severity. CVSS v3 base score is 4.3 out of 10.