{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-67278", "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "state": "PUBLISHED", "assignerShortName": "CERT-PL", "dateReserved": "2026-07-29T11:59:30.538Z", "datePublished": "2026-09-05T20:00:57.258Z", "dateUpdated": "2026-09-05T20:40:10.587Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "shortName": "CERT-PL", "dateUpdated": "2026-09-05T20:40:10.587Z"}, "title": "TLS server impersonation possible in Mikrotik RouterOS", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-347", "description": "CWE-347 Improper verification of cryptographic signature", "type": "CWE"}]}], "affected": [{"vendor": "Mikrotik", "product": "RouterOS", "versions": [{"status": "affected", "version": "7.24", "lessThan": "7.24.2", "versionType": "custom"}, {"status": "affected", "version": "7.0.0", "lessThan": "7.23.4", "versionType": "custom"}, {"status": "affected", "version": "6.0.0", "lessThan": "6.49.21", "versionType": "custom"}], "defaultStatus": "unaffected"}], "cpeApplicability": [{"operator": "OR", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:mikrotik:routeros:*:*:*:*:*:*:*:*", "versionStartIncluding": "0.0.0", "versionEndExcluding": "7.25.1"}]}]}], "descriptions": [{"lang": "en", "value": "MikroTik RouterOS accepts malformed RSA/PKCS#1 v1.5 signatures during X.509 validation. 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.\n\nThis issue was fixed in versions:\u00a06.49.21 (Long-term),\u00a07.23.4 (Long-term)\u00a0and\u00a07.24.2 (Stable)", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<div><span>MikroTik RouterOS accepts malformed RSA/PKCS#1 v1.5 signatures during X.509 validation. 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.</span></div><div>This issue was fixed in versions:&nbsp;6.49.21 (Long-term),&nbsp;7.23.4 (Long-term)&nbsp;and&nbsp;7.24.2 (Stable)</div>"}]}], "references": [{"url": "https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve", "tags": ["third-party-advisory"]}, {"url": "https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/", "tags": ["technical-description"]}, {"url": "https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/", "tags": ["exploit"]}, {"url": "https://mikrotik.com/supportsec/september-2026-vulnerability/", "tags": ["vendor-advisory"]}, {"url": "https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802", "tags": ["release-notes"]}, {"url": "https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801", "tags": ["release-notes"]}, {"url": "https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800", "tags": ["release-notes"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 6.3, "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"}}], "credits": [{"lang": "en", "value": "S\u0142awomir Rozbicki (CERT.PL)", "type": "finder"}], "source": {"discovery": "INTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.3"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "RouterOS", "vendor": "Mikrotik", "versions": [{"lessThan": "7.24.2", "status": "affected", "version": "7.24", "versionType": "custom"}, {"lessThan": "7.23.4", "status": "affected", "version": "7.0.0", "versionType": "custom"}, {"lessThan": "6.49.21", "status": "affected", "version": "6.0.0", "versionType": "custom"}]}], "source": "cvd@cert.pl"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "MikroTik RouterOS accepts malformed RSA/PKCS#1 v1.5 signatures during X.509 validation. 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.\n\nThis issue was fixed in versions:\u00a06.49.21 (Lont-term),\u00a07.23.4 (Lont-term)\u00a0and\u00a07.24.2 (Stable)"}], "id": "CVE-2026-67278", "lastModified": "2026-09-05T20:17:18.257", "metrics": {"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"}]}, "published": "2026-09-05T20:17:18.257", "references": [{"source": "cvd@cert.pl", "url": "https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve"}, {"source": "cvd@cert.pl", "url": "https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/"}, {"source": "cvd@cert.pl", "url": "https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802"}, {"source": "cvd@cert.pl", "url": "https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801"}, {"source": "cvd@cert.pl", "url": "https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800"}, {"source": "cvd@cert.pl", "url": "https://mikrotik.com/supportsec/september-2026-vulnerability/"}, {"source": "cvd@cert.pl", "url": "https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/"}], "sourceIdentifier": "cvd@cert.pl", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-347"}], "source": "cvd@cert.pl", "type": "Primary"}]}

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