{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "RouterOS", "vendor": "Mikrotik", "versions": [{"lessThan": "7.24.3", "status": "affected", "version": "7.24", "versionType": "custom"}, {"lessThan": "7.23.6", "status": "affected", "version": "7.0.0", "versionType": "custom"}]}], "source": "cvd@cert.pl"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*", "matchCriteriaId": "A770020E-95C7-40B0-A981-E2350A27920D", "versionEndExcluding": "7.23.6", "versionStartIncluding": "7.0", "vulnerable": true}, {"criteria": "cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*", "matchCriteriaId": "6E8D92F3-12C1-4382-A90F-203F017ED484", "versionEndExcluding": "7.24.3", "versionStartIncluding": "7.24", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "MikroTik RouterOS accepts malformed RSA/PKCS#1 v1.5 signatures across RSA-based services, including TLS/X.509 certificate validation and SSH host-key authentication. Because its trust store includes an e=3 root CA, an attacker controlling or redirecting an outbound RouterOS TLS connection can use the root\u2019s public certificate - without its private key - to forge a trusted intermediate and issue certificates for arbitrary hostnames, enabling TLS server impersonation. The same permissive verification also undermines RSA-based SSH authentication.\n\n\n\nThis issue affects only 7.x branch was fixed in versions: 7.23.6 (Long-term) and 7.24.3 (Stable).\nReleases 7.23.4 and 7.24.2 included an incomplete fix."}], "id": "CVE-2026-67278", "lastModified": "2026-09-25T14:56:04.743", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.3, "baseSeverity": "MEDIUM", "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": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cvd@cert.pl", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-67278", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-08T15:30:45.430794Z", "version": "2.0.3"}}]}, "published": "2026-09-05T20:17:18.257", "references": [{"source": "cvd@cert.pl", "tags": ["Third Party Advisory"], "url": "https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve"}, {"source": "cvd@cert.pl", "tags": ["Mitigation", "Third Party Advisory"], "url": "https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/"}, {"source": "cvd@cert.pl", "tags": ["Release Notes"], "url": "https://forum.mikrotik.com/t/7-23-6-long-term-is-released/273139"}, {"source": "cvd@cert.pl", "tags": ["Release Notes"], "url": "https://forum.mikrotik.com/t/7-24-3-stable-is-released/273138"}, {"source": "cvd@cert.pl", "tags": ["Vendor Advisory"], "url": "https://mikrotik.com/supportsec/september-2026-vulnerability/"}, {"source": "cvd@cert.pl", "tags": ["Exploit", "Third Party Advisory"], "url": "https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/"}], "sourceIdentifier": "cvd@cert.pl", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-347"}], "source": "cvd@cert.pl", "type": "Secondary"}]}