CVE-2024-6163Network attack vector

Unauthenticated data access via exposed internal endpoints

Published Jul 8, 2024 · Updated Aug 27, 2025

Authentication bypass in Checkmk allows remote attackers to read internal data through directly exposed internal HTTP endpoints. The site Apache configuration applies outdated directives in the wrong order, so local-only filters fail and uncurated X-Forwarded-For input is trusted. Only deployments exposing the site Apache port, typically 5000, are reachable; package installations behind the default reverse proxy are unaffected.

CVSS severity5.3
Medium
EPSS probability0.53%
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

Authentication bypass in Checkmk allows remote attackers to read internal data through directly exposed internal HTTP endpoints. The site Apache configuration applies outdated directives in the wrong order, so local-only filters fail and uncurated X-Forwarded-For input is trusted. Only deployments exposing the site Apache port, typically 5000, are reachable; package installations behind the default reverse proxy are unaffected.

The record

CVE
CVE-2024-6163
Published
Jul 8, 2024
Updated
Aug 27, 2025
Vendor
Checkmk GmbH
Product
Checkmk
Classifications
CWE-290, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 8, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2025Record 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 <2.1.0p46
  3. Affected versionversion=2.2.0 <2.2.0p31
  4. Affected versionversion=2.3.0 <2.3.0p10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Checkmk GmbH · Checkmkversion=2.0.0 <=2.0.0p39; version=2.1.0 <2.1.0p46; version=2.2.0 <2.2.0p31; version=2.3.0 <2.3.0p10

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.3Checkmk GmbHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing
T1190Exploit Public-Facing Application

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