How serious is CVE-2025-64999?

This vulnerability has a CVSS score of 7.3 out of 10, classified as HIGH severity. Proof-of-concept exploit code is publicly available, making this an active threat.

Is there exploit code available for CVE-2025-64999?

Yes, proof-of-concept exploit code for CVE-2025-64999 is publicly available on GitHub and security research platforms. This increases the risk of active exploitation.

Which products are affected by CVE-2025-64999?

CVE-2025-64999 affects checkmk checkmk. Check the full CVE details for specific version information.

How do I fix CVE-2025-64999?

To remediate CVE-2025-64999, check for security patches from checkmk. Apply all available updates and security patches. If no patch is available, implement recommended workarounds or security controls to mitigate the risk.

CVE-2025-64999

High

|7.3

Exploit Available

Plain English Summary

AI-powered analysis for quick understanding

This vulnerability allows an attacker to inject malicious JavaScript into the monitoring logs of Checkmk, which can then be accessed through a specially crafted phishing link. To exploit this, the attacker needs to manipulate the output from a monitored host, making it essential for them to have some level of access to the system.

Technical Description

Improper neutralization of input in Checkmk versions 2.4.0 before 2.4.0p22, and 2.3.0 before 2.3.0p43 allows an attacker that can manipulate a host's check output to inject malicious JavaScript into the Synthetic Monitoring HTML logs, which can then be accessed via a crafted phishing link.

CVSS Vector Analysis

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionRequired

Confidentiality ImpactHigh

Integrity ImpactHigh

Availability ImpactHigh

ScopeChanged

Vector String

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Exploit Resources

Search for proof-of-concept code and exploit modules

GitHub Search Exploit-DB Nuclei Templates Metasploit Vulners

Official References

NIST NVD

Est. Bounty

$1,632($1K-$5K)

Vendor Response

Grade APatched in 4 days

Quick Information

Published

Feb 26, 2026

about 1 month ago

Last Modified

Mar 2, 2026

about 1 month ago

Vendor

checkmk

Product

checkmk

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