{
  "fix": "libmosquitto1 2.0.11-1ubuntu1.1",
  "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libmosquitto1-2.0.11-1ubuntu1.1",
  "summary": "libmosquitto1 2.0.11-1ubuntu1.1, released October 2, 2023, fixes 5 CVEs in libmosquitto1. None of them is reported as exploited. Patch Radar priority: High.",
  "platform": "linux",
  "type": "package",
  "title": "libmosquitto1 2.0.11-1ubuntu1.1 for Ubuntu 22.04.1 LTS (jammy)",
  "released": "2023-10-02T13:15:00Z",
  "priority": "High",
  "priorityTier": 3,
  "priorityReason": "Closes CVE-2021-41039, high severity",
  "supported": true,
  "cveCount": 5,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.01355,
  "maxCvss": 7.5,
  "appliesTo": [
    {
      "product": "libmosquitto1",
      "productUrl": "https://patchblox.com/security/product/linux/libmosquitto1",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "2.0.11-1ubuntu1.1",
      "supported": true
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2021-41039",
      "url": "https://patchblox.com/security/cve/CVE-2021-41039",
      "title": "mosquitto: In versions 1.6 to 2.0.11 of Eclipse Mosquitto, an MQTT v5 client connecting with a large number of user-property pro...",
      "priority": "High",
      "severity": "high",
      "cvss": 7.5,
      "epss": 0.01355,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2023-28366",
      "url": "https://patchblox.com/security/cve/CVE-2023-28366",
      "title": "mosquitto: The broker in Eclipse Mosquitto 1.3.2 through 2.x before 2.0.16 has a memory leak that can be abused remotely when a...",
      "priority": "High",
      "severity": "high",
      "cvss": 7.5,
      "epss": 0.0131,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2023-3592",
      "url": "https://patchblox.com/security/cve/CVE-2023-3592",
      "title": "mosquitto: In Mosquitto before 2.0.16, a memory leak occurs when clients send v5 CONNECT packets with a will message that contai...",
      "priority": "High",
      "severity": "high",
      "cvss": 7.5,
      "epss": 0.00787,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-34434",
      "url": "https://patchblox.com/security/cve/CVE-2021-34434",
      "title": "mosquitto: mosquitto - security update",
      "priority": "Routine",
      "severity": "Medium",
      "epss": 0.0133,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2023-0809",
      "url": "https://patchblox.com/security/cve/CVE-2023-0809",
      "title": "libmosquitto1: In Mosquitto before 2.0.16, excessive memory is allocated based on malicious initial packets that are not CONNECT pac...",
      "priority": "Routine",
      "severity": "Medium",
      "cvss": 5.3,
      "epss": 0.00709,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-12T19:57:06Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}