{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-67277", "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "state": "PUBLISHED", "assignerShortName": "CERT-PL", "dateReserved": "2026-07-29T11:59:30.538Z", "datePublished": "2026-09-05T20:00:56.614Z", "dateUpdated": "2026-09-11T03:55:58.675Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "shortName": "CERT-PL", "dateUpdated": "2026-09-05T20:39:44.166Z" }, "title": "Kernel memory disclosure and denial of service in MikroTik RouterOS btest service", "problemTypes": [ { "descriptions": [ { "lang": "en", "cweId": "CWE-306", "description": "CWE-306 Missing authentication for critical function", "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": "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.\n\n\n\nThis issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)", "supportingMedia": [ { "type": "text/html", "base64": false, "value": "
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.
This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)
" } ] } ], "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": "Sławomir 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" } ] } ] } }