CVE-2023-23549

CVE-2023-23549 is a low-severity vulnerability in Checkmk with a CVSS 3.x base score of 2.7. 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-1284.

Key facts

• Severity: Low (CVSS 3.x base score 2.7)
• EPSS exploit prediction: 1% (46th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-1284
• Affected product: Checkmk
• Published: 2023-11-15
• Last modified: 2026-06-17

Description

Improper Input Validation in Checkmk <2.2.0p15, <2.1.0p37, <=2.0.0p39 allows priviledged attackers to cause partial denial of service of the UI via too long hostnames.

Frequently asked questions

What is CVE-2023-23549?

Improper Input Validation in Checkmk <2.2.0p15, <2.1.0p37, <=2.0.0p39 allows priviledged attackers to cause partial denial of service of the UI via too long hostnames.

How severe is CVE-2023-23549?

CVE-2023-23549 has a CVSS 3.x base score of 2.7, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2023-23549 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-23549?

CVE-2023-23549 primarily affects Checkmk. In total, 118 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-23549?

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

When was CVE-2023-23549 published?

CVE-2023-23549 was published on 2023-11-15 and last updated on 2026-06-17.

References

• https://checkmk.com/werk/16219

Affected products (118)

• cpe:2.3:a:checkmk:checkmk:2.0.0:-:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:b1:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:b2:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:b3:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:b4:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:b5:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:b6:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:b7:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:b8:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:i1:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p1:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p10:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p11:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p12:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p13:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p14:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p15:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p16:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p17:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p18:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p19:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p2:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p20:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p21:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p22:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p23:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p24:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p25:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p26:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p27:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p28:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p29:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p3:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p30:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p31:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p32:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p33:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p34:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p35:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:2.0.0:p36:*:*:*:*:*:*

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