CVE-2025-58126Network attack vector

Traffic interception via unverified TLS certificates

Published Aug 28, 2025 · Updated Aug 28, 2025

Improper certificate validation in the Checkmk Exchange VMware vSAN plug-in allows remote attackers to intercept its TLS traffic. The plug-in's outbound vSAN connection establishes TLS sessions without performing certificate verification, allowing a network-path attacker to impersonate the monitored endpoint. Exploitation requires a machine-in-the-middle position and exposes confidential monitoring traffic while permitting tampering with data returned to Checkmk.

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 the Checkmk Exchange VMware vSAN plug-in allows remote attackers to intercept its TLS traffic. The plug-in's outbound vSAN connection establishes TLS sessions without performing certificate verification, allowing a network-path attacker to impersonate the monitored endpoint. Exploitation requires a machine-in-the-middle position and exposes confidential monitoring traffic while permitting tampering with data returned to Checkmk.

The record

CVE
CVE-2025-58126
Published
Aug 28, 2025
Updated
Aug 28, 2025
Vendor
VMware
Product
VMware vSAN
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. Aug 28, 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?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

VMware · VMware vSANAffected versions are unavailable in this record.

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 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-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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