{
  "crds_version": "0.1",
  "kind": "base",
  "id": "crds:cve-2026-67277",
  "revision": 1,
  "title": "MikroTik RouterOS — Unauthenticated btest Kernel Memory Leak and Crash",
  "summary": "MikroTik RouterOS accepts a related bandwidth-test (btest) connection before its primary session has logged in. An unauthenticated client can start a test that leaks uninitialized kernel memory, and a size underflow can restart the router's kernel. Exploited in the wild.",
  "source_type": "cve",
  "severity": "high",
  "cvss": {
    "score": 8.2,
    "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
    "version": "3.1"
  },
  "epss": 0.00869,
  "exploitation": {
    "known_exploited": true,
    "exploit_available": true,
    "attack_complexity": "low",
    "kev_added": "2026-09-10",
    "prerequisites": "Network access to the RouterOS bandwidth-test (btest) service; no credentials or user interaction needed"
  },
  "remediation": {
    "patch_available": true,
    "fixed_in": [
      "routeros 6.49.21 (long-term)",
      "routeros 7.23.4 (long-term)",
      "routeros 7.24.2 (stable)"
    ]
  },
  "mitre_attack": [
    "T1190",
    "T1499"
  ],
  "kill_chain": "impact",
  "recommended_action": "Upgrade RouterOS to 6.49.21, 7.23.4 or 7.24.2 now; until then block the bandwidth-test (btest) service from untrusted networks and watch for unexpected router restarts.",
  "confidence": "high",
  "provenance": [
    {
      "fields": [
        "cvss",
        "exploitation.attack_complexity",
        "exploitation.exploit_available",
        "references",
        "published_at"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2026-67277",
      "retrieved_at": "2026-09-20T10:52:56.734Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "exploitation.known_exploited",
        "exploitation.kev_added"
      ],
      "source": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "retrieved_at": "2026-09-20T10:52:56.734Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "epss"
      ],
      "source": "https://api.first.org/data/v1/epss?cve=CVE-2026-67277",
      "retrieved_at": "2026-09-20T10:52:56.734Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "title",
        "summary",
        "severity",
        "remediation",
        "mitre_attack",
        "kill_chain",
        "recommended_action",
        "confidence",
        "tags",
        "exploitation.prerequisites"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2026-67277",
      "retrieved_at": "2026-09-20T10:52:56.734Z",
      "confidence": "high",
      "extractor": "claude-code"
    },
    {
      "fields": [
        "exploitation.prerequisites"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2026-67277",
      "retrieved_at": "2026-09-20T11:09:51.520Z",
      "confidence": "high",
      "extractor": "human"
    }
  ],
  "references": [
    {
      "type": "cve",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67277",
      "label": "NVD record"
    },
    {
      "type": "cisa",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "label": "CISA Known Exploited Vulnerabilities catalog"
    },
    {
      "type": "vendor_advisory",
      "url": "https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/"
    },
    {
      "type": "vendor_advisory",
      "url": "https://mikrotik.com/supportsec/september-2026-vulnerability/"
    },
    {
      "type": "exploit",
      "url": "https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/"
    }
  ],
  "published_at": "2026-09-05T20:17:18.120Z",
  "issued_at": "2026-09-20T10:52:56.734Z",
  "tags": [
    "mikrotik-routeros",
    "btest",
    "missing-authentication",
    "information-disclosure",
    "denial-of-service"
  ]
}