CVE-2026-67277

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An unauthenticated client can use this state to start an IPv4 UDP test. With \"random-data=false\", the sender transmits an uninitialized tail from a kernel packet buffer. A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel.\n\n\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><div>RouterOS accepts a \"related\" btest connection before the corresponding primary session has completed authentication. An unauthenticated client can use this state to start an IPv4 UDP test. With \"random-data=false\", the sender transmits an uninitialized tail from a kernel packet buffer. A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel.</div></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": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "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": "HIGH", "baseScore": 8.8, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/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"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-08T00:00:00+00:00", "options": [{"Exploitation": "active"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3", "id": "CVE-2026-67277"}}}, {"other": {"type": "kev", "content": {"dateAdded": "2026-09-10", "reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-67277"}}}], "references": [{"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-67277", "tags": ["government-resource"]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-11T03:55:58.675Z"}, "timeline": [{"time": "2026-09-10T00:00:00.000Z", "lang": "en", "value": "CVE-2026-67277 added to CISA KEV"}]}]}}

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A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel.</div></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>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-306", "description": "CWE-306 Missing authentication for critical function"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:mikrotik:routeros:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.25.1", "versionStartIncluding": "0.0.0"}], "operator": "OR"}], "operator": "OR"}], "providerMetadata": {"orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "shortName": "CERT-PL", "dateUpdated": "2026-09-05T20:39:44.166Z"}}}, "cveMetadata": {"cveId": "CVE-2026-67277", "state": "PUBLISHED", "dateUpdated": "2026-09-10T19:58:23.754Z", "dateReserved": "2026-07-29T11:59:30.538Z", "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "datePublished": "2026-09-05T20:00:56.614Z", "assignerShortName": "CERT-PL"}, "dataVersion": "5.2"}

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