Security advisory

{
  "id": "34d7a692ecf60bfa9505de0f27cd97312728981cef2605b4e0026ad0013f610c",
  "url": "https://osv.dev/vulnerability/CVE-2018-18765",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-18765",
    "summary": "An exploitable arbitrary memory read vulnerability exists in the MQTT packet-parsing functionality of Cesanta Mongoose 6.13. It is a heap-based buffer over-read in mg_mqtt_next_subscribe_topic. A specially crafted MQTT SUBSCRIBE packet can cause an arbitrary out-of-bounds memory read potentially resulting in information disclosure and denial of service. An attacker needs to send a specially crafted MQTT packet over the network to trigger this vulnerability.",
    "evidence": "osv:CVE-2018-18765",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2018-18765",
      "aliases": [
        "CVE-2018-18765"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/cesanta/mongoose",
              "type": "GIT",
              "events": [
                {
                  "introduced": "95afa323c0e7740151f661629616daebe2915b61"
                },
                {
                  "last_affected": "95afa323c0e7740151f661629616daebe2915b61"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:cesanta:mongoose:6.13:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "6.13"
                      },
                      {
                        "last_affected": "6.13"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "6.13"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-18765.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:50.656623649Z",
      "provider": "osv",
      "references": [
        "https://twitter.com/thracky/status/1059472674940993541",
        "https://github.com/TiffanyBlue/PoCbyMyself/blob/master/mongoose6.13/mqtt/Cesanta%20Mongoose%20MQTT%20mg_mqtt_next_subscribe_topic%20heap%20buffer%20overflow.md"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2018-18765",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 437293,
  "published_at": "2018-10-29T12:29:10.273+00:00"
}