Security advisory

{
  "id": "5281668d9b06bd5d72b325f11b9c5cefddb345fd1a1dd29ae6455fca1cffd166",
  "url": "https://osv.dev/vulnerability/CVE-2023-0809",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2023-0809",
    "summary": "In Mosquitto before 2.0.16, excessive memory is allocated based on malicious initial packets that are not CONNECT packets.",
    "evidence": "osv:CVE-2023-0809",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2023-0809",
      "aliases": [
        "CVE-2023-0809"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/eclipse-mosquitto/mosquitto",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "9e0831b3ed87f9b9a60a01f74040a077f40946c4"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:eclipse:mosquitto:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.0.16"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.0.15",
            "v2.0.14",
            "v2.0.13",
            "v2.0.12",
            "v2.0.11",
            "v2.0.10",
            "v2.0.9",
            "v2.0.8",
            "v2.0.7",
            "v2.0.6",
            "v2.0.5",
            "v2.0.4",
            "v2.0.3",
            "v2.0.2",
            "v2.0.1",
            "v2.0.0",
            "v1.6.12",
            "v1.6.11",
            "v1.6.10",
            "v1.6.9",
            "v1.6.8",
            "v1.6.7",
            "v1.6.6",
            "v1.6.5",
            "v1.6.4",
            "v1.6.3",
            "v1.6.2",
            "v1.6.1",
            "v1.6",
            "v1.5",
            "v1.4.15",
            "v1.4.14",
            "v1.4.13",
            "v1.4.12",
            "v1.4.11",
            "v1.4.10",
            "v1.4.9",
            "v1.4.8",
            "v1.4.7",
            "v1.4.6",
            "v1.4.5",
            "v1.4.4",
            "v1.4.3",
            "v1.4.2",
            "v1.4.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-0809.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.506133602Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/0xxx/CVE-2023-0809.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-0809",
        "https://security.gentoo.org/glsa/202401-09",
        "https://mosquitto.org/blog/2023/08/version-2-0-16-released/"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-789"
        ],
        "cna_assigner": "eclipse",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "2.0.16"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/0xxx/CVE-2023-0809.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-0809",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492171,
  "published_at": "2023-10-02T18:56:26.824+00:00"
}