CVE-2025-64997 in Checkmk
Summary
by MITRE • 12/18/2025
Insufficient permission validation in Checkmk versions prior to 2.4.0p17 and 2.3.0p42 allow low-privileged users to view agent information via the REST API, which could lead to information disclosure.
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Analysis
by VulDB Data Team • 12/24/2025
This vulnerability resides in the Checkmk monitoring platform where insufficient permission validation mechanisms exist in versions prior to 2.4.0p17 and 2.3.0p42. The flaw specifically affects the REST API endpoints that handle agent information retrieval, allowing users with minimal privileges to access sensitive data that should be restricted to authorized administrators only. The vulnerability represents a classic authorization bypass issue where the system fails to properly verify user permissions before granting access to agent-specific information through the programmatic interface.
The technical implementation of this weakness stems from inadequate input validation and access control checks within the REST API layer. When low-privileged users make requests to retrieve agent information, the system does not sufficiently authenticate whether the requesting user has appropriate clearance levels to access such data. This failure in permission validation creates an information disclosure vector where attackers can potentially gather detailed information about monitored systems, including agent versions, hostnames, and potentially other system identifiers that could aid in further exploitation attempts. The vulnerability aligns with CWE-285 which addresses insufficient authorization issues in software systems.
The operational impact of this vulnerability extends beyond simple information disclosure as it provides attackers with valuable reconnaissance data that could be used to map the monitored infrastructure and identify potential attack vectors. An attacker who gains access to agent information could potentially correlate this data with known vulnerabilities in specific agent versions, or use the information to craft more targeted attacks against the monitored systems. The risk is particularly elevated in environments where Checkmk serves as a critical monitoring solution for enterprise infrastructure, as the leaked information could reveal the operational attack surface of the organization's IT assets.
Organizations should immediately upgrade to Checkmk versions 2.4.0p17 or 2.3.0p42 where the permission validation has been properly implemented to address this vulnerability. System administrators should also conduct comprehensive audits of REST API access logs to identify any unauthorized access attempts that may have occurred prior to the patch deployment. Security teams should implement additional monitoring for unusual API access patterns and consider implementing rate limiting and access control policies to minimize the impact of potential exploitation attempts. This vulnerability demonstrates the critical importance of proper access control implementation in API-based systems and aligns with ATT&CK technique T1083 which covers directory and file discovery activities that attackers often use to gather system information for further compromise.