EUVD-2026-70973
GHSA-p53j-vwhv-xp3w
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/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
UUID-sharing precondition makes exploitation non-trivial (AC:H); controlling one agent component is required (PR:L); no availability impact.
Primary rating from Vendor (Checkmk).
CVSS VectorVendor: Checkmk
Lifecycle Timeline
3DescriptionCVE.org
Improper certificate validation in Checkmk <2.5.0p10 allows a relay and a push agent that share the same UUID to reuse each other's mTLS certificate to authenticate against agent receiver endpoints in either direction, because the endpoints do not verify that the certificate was issued by their own root certificate.
AnalysisAI
mTLS certificate reuse in Checkmk before 2.5.0p10 enables a relay or push agent to authenticate against agent receiver endpoints using a peer component's certificate, provided both share the same UUID. The agent receiver endpoints fail to verify that a presented client certificate was issued by their own root CA, breaking the intended role-based trust boundary between relay and push agent components. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two specific preconditions: first, a relay agent and a push agent must share the same UUID within the Checkmk deployment, a non-default condition typically caused by template cloning or misconfiguration; second, the attacker must have control of one of these agent components (or access to its private mTLS key), satisfying the PR:L requirement. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N) scores 5.3 (Medium), reflecting limited per-hop impact and a requirement for low-level privileges. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Checkmk to version 2.5.0p10 or later, which corrects the agent receiver endpoint's certificate validation logic to enforce root-CA ownership verification; see the vendor advisory at https://checkmk.com/werk/19735. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-295 – Improper Certificate Validation
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External POC / Exploit Code
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