CVE-2023-23549Network attack vector

Partial UI denial of service via oversized hostnames

Published Nov 15, 2023 · Updated Aug 28, 2024

Improper input validation in Checkmk before 2.2.0p15 allows remote authenticated users to disrupt parts of the web UI. Host creation accepts names longer than filesystem limits and embeds each hostname in file paths, causing path-length errors that render GUI functions unusable. Administrative privileges are required; affected branches are 2.0.0 through 2.0.0p39, before 2.1.0p37, and before 2.2.0p15.

CVSS severity2.7
Low
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper input validation in Checkmk before 2.2.0p15 allows remote authenticated users to disrupt parts of the web UI. Host creation accepts names longer than filesystem limits and embeds each hostname in file paths, causing path-length errors that render GUI functions unusable. Administrative privileges are required; affected branches are 2.0.0 through 2.0.0p39, before 2.1.0p37, and before 2.2.0p15.

The record

CVE
CVE-2023-23549
Published
Nov 15, 2023
Updated
Aug 28, 2024
Vendor
Checkmk GmbH
Product
Checkmk
Classifications
CWE-1284, CAPEC-153, T1499
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Nov 15, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.0.0 <=2.0.0p39
  2. Affected versionversion=2.1.0 <2.1.0p37
  3. Affected versionversion=2.2.0 <2.2.0p15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Checkmk GmbH · Checkmkversion=2.0.0 <=2.0.0p39; version=2.1.0 <2.1.0p37; version=2.2.0 <2.2.0p15

Published CVSS scores

2.7Checkmk GmbHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1284Improper Validation of Specified Quantity in Input
CAPEC-153Input Data Manipulation
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo