How severe is CVE-2023-2020?

CVE-2023-2020 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2023-2020 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-2020?

CVE-2023-2020 primarily affects Checkmk. In total, 41 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-2020?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-2020 published?

CVE-2023-2020 was published on 2023-04-18 and last updated on 2026-06-17.

CVE-2023-2020

CVE-2023-2020 is a medium-severity vulnerability in Checkmk with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-863
Affected product: Checkmk
Published: 2023-04-18
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2023-2020?: CVE-2023-2020 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2023-2020 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-2020?: CVE-2023-2020 primarily affects Checkmk. In total, 41 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-2020?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-2020 published?: CVE-2023-2020 was published on 2023-04-18 and last updated on 2026-06-17.

References

https://checkmk.com/werk/13981

Affected products (41)

cpe:2.3:a:checkmk:checkmk:2.1.0:-:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:b1:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:b2:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:b3:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:b4:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:b5:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:b6:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:b7:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:b8:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:b9:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p1:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p10:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p11:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p12:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p13:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p14:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p15:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p16:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p17:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p18:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p2:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p20:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p21:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p22:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p23:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p24:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p25:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p26:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p27:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p3:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p4:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p5:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p6:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p7:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p8:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.1.0:p9:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:b1:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:b2:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:b3:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:b4:*:*:*:*:*:*

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