{
  "cveId": "CVE-2023-0809",
  "url": "https://patchblox.com/security/cve/CVE-2023-0809",
  "summary": "CVE-2023-0809 is fixed in 4 products on 1 platform, first by libmosquitto1 1.6.9-1ubuntu0.1~esm1, released October 2, 2023. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "libmosquitto1: In Mosquitto before 2.0.16, excessive memory is allocated based on malicious initial packets that are not CONNECT pac...",
  "description": "In Mosquitto before 2.0.16, excessive memory is allocated based on malicious initial packets that are not CONNECT packets.",
  "published": "2023-10-02T12:15:00Z",
  "severity": "Medium",
  "cvss": 5.3,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
  "epss": 0.00709,
  "epssPercentile": 0.53731,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libmosquitto1",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.6.9-1ubuntu0.1~esm1",
      "fix": "libmosquitto1 1.6.9-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libmosquitto1-1.6.9-1ubuntu0.1-esm1",
      "released": "2023-10-02T13:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libmosquitto1",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "2.0.11-1ubuntu1.1",
      "fix": "libmosquitto1 2.0.11-1ubuntu1.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libmosquitto1-2.0.11-1ubuntu1.1",
      "released": "2023-10-02T13:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libmosquittopp1",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.6.9-1ubuntu0.1~esm1",
      "fix": "libmosquittopp1 1.6.9-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libmosquittopp1-1.6.9-1ubuntu0.1-esm1",
      "released": "2023-10-02T13:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libmosquittopp1",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "2.0.11-1ubuntu1.1",
      "fix": "libmosquittopp1 2.0.11-1ubuntu1.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libmosquittopp1-2.0.11-1ubuntu1.1",
      "released": "2023-10-02T13:15:00Z"
    },
    {
      "platform": "linux",
      "product": "mosquitto",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "2.0.11-1.2\u002Bdeb12u1",
      "fix": "DEBIAN-CVE-2023-0809",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-0809",
      "released": "2023-10-02T19:15:09Z"
    },
    {
      "platform": "linux",
      "product": "mosquitto",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "2.0.17-1",
      "fix": "DEBIAN-CVE-2023-0809",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-0809",
      "released": "2023-10-02T19:15:09Z"
    },
    {
      "platform": "linux",
      "product": "mosquitto",
      "release": "Debian 14",
      "fixedVersion": "2.0.17-1",
      "fix": "DEBIAN-CVE-2023-0809",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-0809",
      "released": "2023-10-02T19:15:09Z"
    },
    {
      "platform": "linux",
      "product": "mosquitto",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.6.9-1ubuntu0.1~esm1",
      "fix": "mosquitto 1.6.9-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-mosquitto-1.6.9-1ubuntu0.1-esm1",
      "released": "2023-10-02T13:15:00Z"
    },
    {
      "platform": "linux",
      "product": "mosquitto",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "2.0.11-1ubuntu1.1",
      "fix": "mosquitto 2.0.11-1ubuntu1.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-mosquitto-2.0.11-1ubuntu1.1",
      "released": "2023-10-02T13:15:00Z"
    },
    {
      "platform": "linux",
      "product": "mosquitto-clients",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.6.9-1ubuntu0.1~esm1",
      "fix": "mosquitto-clients 1.6.9-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-mosquitto-clients-1.6.9-1ubuntu0.1-esm1",
      "released": "2023-10-02T13:15:00Z"
    },
    {
      "platform": "linux",
      "product": "mosquitto-clients",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "2.0.11-1ubuntu1.1",
      "fix": "mosquitto-clients 2.0.11-1ubuntu1.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-mosquitto-clients-2.0.11-1ubuntu1.1",
      "released": "2023-10-02T13:15:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-07T18:46:35Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}