Security advisory

{
  "id": "be0782de9afb35aa2b7f242c1809b514be1524cc5f46a0999a1e65efa2de5a26",
  "url": "https://osv.dev/vulnerability/CVE-2018-19417",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-19417",
    "summary": "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.",
    "evidence": "osv:CVE-2018-19417",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2018-19417",
      "aliases": [
        "CVE-2018-19417"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/contiki-ng/contiki-ng",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "7b076e4af14b2259596f6d3765105d0593ae5257"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:contiki-ng:contiki-ng:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "release/v4.1",
            "release/v4.0",
            "develop/v4.0",
            "fork",
            "develop/v3.x-fork",
            "old/v2.6",
            "2.6-rc0",
            "2.6",
            "2.5-release",
            "old/v2.4",
            "2.4",
            "old/v2.3",
            "2.3",
            "old/v2.2.3",
            "2.2.3",
            "old/v2.2.2",
            "2.2.2",
            "old/v2.2.1",
            "2.2.1",
            "old/v2.2",
            "2.2",
            "old/v2.1",
            "2.1",
            "old/v2.0",
            "2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-19417.json"
          }
        }
      ],
      "modified": "2026-10-20T10:50:06.068429080Z",
      "provider": "osv",
      "references": [
        "https://github.com/contiki-ng/contiki-ng/issues/600"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2018-19417",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 381268,
  "published_at": "2018-11-21T20:29:00.307+00:00"
}