CVE-2025-39666

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"lastModified": "2026-10-12T22:10:00.247", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.3, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.3, "baseSeverity": "CRITICAL", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "HIGH", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security@checkmk.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-39666", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-04-07T13:18:12.687066Z", "version": "2.0.3"}}]}, "published": "2026-04-07T13:16:44.847", "references": [{"source": "security@checkmk.com", "tags": ["Vendor Advisory"], "url": "https://checkmk.com/werk/18891"}], "sourceIdentifier": "security@checkmk.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-426"}, {"lang": "en", "value": "CWE-829"}], "source": "security@checkmk.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.2.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[2.3.0,2.3.0p46)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[2.4.0,2.4.0p25)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[2.5.0b1,2.5.0b3)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Checkmk", "source": "cna", "vendor": "Checkmk GmbH"}, "product": "checkmk", "vendor": "checkmk"}], "analysis": {"en": {"generated_at": "2026-04-14T16:30:43.797831+00:00", "value": {"mitigation_remediation": ["Apply the official patch for your Checkmk version: upgrade to 2.3.0p46 or newer, 2.4.0p25 or newer, or 2.5.0b3 or newer, or transition to the latest stable release.", "If an update cannot be applied immediately, reduce the write permissions of site users for files that are processed by omd, effectively preventing the manipulation that triggers the elevation.", "Enable and review audit logs for file modifications in the site context to detect potential abuse, and monitor for unexpected ownership changes.", "Verify the integrity of the Checkmk installation after any updates and confirm that the omd command runs without unintended privilege escalation."], "summary": {"action": "Patch Now", "impact": "Root Privilege Escalation"}, "threat_synthesis": {"affected_systems": "Affects Checkmk 2.2.0 (end of life), all 2.3.0 releases prior to patch 2.3.0p46, all 2.4.0 releases prior to patch 2.4.0p25, and the beta 2.5.0 releases prior to update 2.5.0b3. Any installation of these versions that has the omd service running as root is vulnerable.", "description_and_impact": "This vulnerability permits a site user in Checkmk to elevate privileges to root by manipulating files in the site context that are processed during an omd command run by root. The flaw arises from insufficient validation of files handled by root\u2011executed administrative commands, allowing destructive modification. An attacker who can write into the site context can thereby gain full system control.", "risk_and_exploitability": "With a CVSS score of 9.3 the issue is considered critical. EPSS indicates a very low probability of exploitation, less than 1 percent, and the vulnerability is not listed in the CISA KEV catalog. The attack vector is local, requiring the attacker to be a legitimate site user with write access to the site context. If achieved, the attacker can become root and compromise the entire host. Administrators should treat this as a high\u2011risk vulnerability that warrants immediate patching."}}}}, "created": "2026-04-08T19:38:25.695499+00:00", "updated": "2026-04-14T16:41:05.555903+00:00", "vendors": ["checkmk", "checkmk$PRODUCT$checkmk"]}