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CVE-2023-2020

18
FAUCET Score

CVE-2023-2020 describes an insufficient permission check vulnerability within the REST API of Tribe29 Checkmk versions <= 2.1.0p27 and <= 2.2.0b4 (beta). This flaw allows authenticated but unauthorized users to schedule downtimes for any host monitored by Checkmk. The vulnerability carries a CVSS score of 4.3 (MEDIUM), indicating a low-complexity attack that can be executed over the network with low privileges, resulting in a low impact on integrity (scheduling unauthorized downtimes). There is no impact on confidentiality or availability. Currently, there is no evidence of active exploitation, and no public exploit code (Metasploit, Nuclei, ExploitDB) is available. Community discussion and media coverage for this CVE are minimal, aligning with the typical low attention for most reported vulnerabilities.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.1.0, <= 2.1.0p27CPE match
cpe:2.3:a:tribe29:checkmk:*:*:*:*:*:*:*:*
2.1.0CPE matchmatch criteria
cpe:2.3:a:checkmk:checkmk:2.1.0:-:*:*:*:*:*:*
2.1.0CPE matchmatch criteria
cpe:2.3:a:checkmk:checkmk:2.1.0:b1:*:*:*:*:*:*
2.1.0CPE matchmatch criteria
cpe:2.3:a:checkmk:checkmk:2.1.0:b2:*:*:*:*:*:*
2.1.0CPE matchmatch criteria
cpe:2.3:a:checkmk:checkmk:2.1.0:b3:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.3MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.40%
Probability of exploitation in next 30 days
EPSS Percentile
32.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0040 is in the 42nd percentile among its peer group of 21,977 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

checkmk.com / werk/13981
Vendor Advisory