CVE-2025-58124Network attack vector

API traffic interception via unchecked TLS certificates

Published Aug 28, 2025 · Updated Oct 7, 2025

Improper certificate validation in Check_MK Python API 2.2 through 6.1.0 allows man-in-the-middle attackers to intercept API traffic. The API wrapper establishes HTTPS sessions without validating the server certificate, so a forged endpoint is accepted as the configured Checkmk server. Exploitation requires control of the network path; intercepted API traffic can be read or altered, while availability is unaffected.

CVSS severity6.9
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Check_MK Python API 2.2 through 6.1.0 allows man-in-the-middle attackers to intercept API traffic. The API wrapper establishes HTTPS sessions without validating the server certificate, so a forged endpoint is accepted as the configured Checkmk server. Exploitation requires control of the network path; intercepted API traffic can be read or altered, while availability is unaffected.

The record

CVE
CVE-2025-58124
Published
Aug 28, 2025
Updated
Oct 7, 2025
Vendor
Heinlein Consulting GmbH
Product
Check_MK Python API
Classifications
CWE-295, CAPEC-384, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 7, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=2.2 <6.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Heinlein Consulting GmbH · Check_MK Python APIversion=2.2 <6.1.1

Published CVSS scores

6.9Checkmk GmbHCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:N/SA:N
4.8NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation
CAPEC-384Application API Message Manipulation via Man-in-the-Middle
T1557Adversary-in-the-Middle

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

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Your stack

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