{ "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": "