{
    "id": "CVE-2026-67277",
    "published": "2026-09-05 20:17:18",
    "last_modified": "2026-09-11 12:52:29",
    "cvss_score": "8.2",
    "cvss_severity": "HIGH",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
    "cwe": "CWE-306",
    "description": "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)",
    "epss_score": "0.01560",
    "epss_percentile": "0.74237",
    "kev": 1,
    "kev_due": "2026-09-13",
    "has_exploit": 0,
    "updated_at": "2026-09-27 18:18:01",
    "priority": {
        "rank": 1,
        "label": "Patch first",
        "why": "On CISA KEV — known exploited in the wild, due 2026-09-13."
    },
    "products": [
        {
            "vendor": "mikrotik",
            "product": "routeros"
        }
    ],
    "kev_detail": {
        "cve_id": "CVE-2026-67277",
        "date_added": "2026-09-10",
        "due_date": "2026-09-13",
        "vendor": "MikroTik",
        "product": "RouterOS",
        "name": "MikroTik RouterOS Missing Authentication for Critical Function Vulnerability",
        "ransomware": 0
    },
    "exploits": [],
    "refs_list": [
        "https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve",
        "https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/",
        "https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802",
        "https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801",
        "https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800",
        "https://mikrotik.com/supportsec/september-2026-vulnerability/",
        "https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/",
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-67277"
    ]
}