What is CVE-2023-31211?

CVE-2023-31211 is a high-severity vulnerability in Checkmk, classified under Incorrect Implementation of Authentication Algorithm. CVSS score: 8.8/10. Published 2024-01-12.

How severe is CVE-2023-31211?

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

Vulnerability in Checkmk

CVE-2023-31211

Insufficient authentication flow in Checkmk before 2.2.0p18, 2.1.0p38 and 2.0.0p39 allows attacker to use locked credentials

Published 2024-01-12 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.005 (41.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000

Affected products

Checkmk — versions 2.0.0, 2.1.0, 2.2.0
Checkmk Gmbh — versions 2.2.0, 2.1.0, 2.0.0
Tribe29 Checkmk

Weakness classification (CWE)

References

checkmk.com/werk/16227 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2023-31211?: CVE-2023-31211 is a high-severity vulnerability in Checkmk, classified under Incorrect Implementation of Authentication Algorithm. CVSS score: 8.8/10. Published 2024-01-12.
How severe is CVE-2023-31211?: High severity. CVSS v3 base score is 8.8 out of 10.