{
    "id": "CVE-2018-19417",
    "published": "2018-11-21 20:29:00",
    "last_modified": "2026-06-17 01:49:16",
    "cvss_score": "10.0",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.0",
    "cvss_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
    "cwe": "CWE-119",
    "description": "An issue was discovered in the MQTT server in Contiki-NG before 4.2. The function parse_publish_vhdr() that parses MQTT PUBLISH messages with a variable length header uses memcpy to input data into a fixed size buffer. The allocated buffer can fit only MQTT_MAX_TOPIC_LENGTH (default 64) bytes, and a length check is missing. This could lead to Remote Code Execution via a stack-smashing attack (overwriting the function return address). Contiki-NG does not separate the MQTT server from other servers and the OS modules, so access to all memory regions is possible.",
    "epss_score": "0.05692",
    "epss_percentile": "0.92788",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-06 18:17:18",
    "priority": {
        "rank": 3,
        "label": "In your normal cycle",
        "why": "Critical by CVSS (10), but no sign of active exploitation."
    },
    "products": [
        {
            "vendor": "contiki-ng",
            "product": "contiki-ng"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "https://github.com/contiki-ng/contiki-ng/issues/600",
        "https://github.com/contiki-ng/contiki-ng/issues/600"
    ]
}