{
  "cveId": "CVE-2018-12551",
  "url": "https://patchblox.com/security/cve/CVE-2018-12551",
  "summary": "CVE-2018-12551 is fixed in 4 products on 1 platform, first by libmosquitto1 1.4.15-2ubuntu0.18.04.1, released March 27, 2019. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "libmosquitto1: When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use a password file for authentication, any...",
  "description": "When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use a password file for authentication, any malformed data in the password file will be treated as valid. This typically means that the malformed data becomes a username and no password. If this occurs, clients can circumvent authentication and get access to the broker by using the malformed username. In particular, a blank line will be treated as a valid empty username. Other security measures are unaffected. Users who have only used the mosquitto_passwd utility to create and modify their password files are unaffected by this vulnerability.",
  "published": "2019-03-27T11:29:00Z",
  "severity": "Medium",
  "epss": 0.01475,
  "epssPercentile": 0.73995,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libmosquitto1",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.4.15-2ubuntu0.18.04.1",
      "fix": "libmosquitto1 1.4.15-2ubuntu0.18.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libmosquitto1-1.4.15-2ubuntu0.18.04.1",
      "released": "2019-03-27T11:29:00Z"
    },
    {
      "platform": "linux",
      "product": "libmosquittopp1",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.4.15-2ubuntu0.18.04.1",
      "fix": "libmosquittopp1 1.4.15-2ubuntu0.18.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libmosquittopp1-1.4.15-2ubuntu0.18.04.1",
      "released": "2019-03-27T11:29:00Z"
    },
    {
      "platform": "linux",
      "product": "mosquitto",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.4.15-2ubuntu0.18.04.1",
      "fix": "mosquitto 1.4.15-2ubuntu0.18.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-mosquitto-1.4.15-2ubuntu0.18.04.1",
      "released": "2019-03-27T11:29:00Z"
    },
    {
      "platform": "linux",
      "product": "mosquitto-clients",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.4.15-2ubuntu0.18.04.1",
      "fix": "mosquitto-clients 1.4.15-2ubuntu0.18.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-mosquitto-clients-1.4.15-2ubuntu0.18.04.1",
      "released": "2019-03-27T11:29:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}