{
  "cveId": "CVE-2019-20840",
  "url": "https://patchblox.com/security/cve/CVE-2019-20840",
  "summary": "CVE-2019-20840 is fixed in 3 products on 1 platform, first by libvncclient1 0.9.11\u002Bdfsg-1ubuntu1.3, released June 17, 2020. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "libvncclient1: An issue was discovered in LibVNCServer before 0.9.13",
  "description": "An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of unaligned accesses in hybiReadAndDecode.",
  "published": "2020-06-17T09:15:00Z",
  "severity": "Medium",
  "epss": 0.02733,
  "epssPercentile": 0.86184,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libvncclient1",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "0.9.11\u002Bdfsg-1ubuntu1.3",
      "fix": "libvncclient1 0.9.11\u002Bdfsg-1ubuntu1.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libvncclient1-0.9.11-dfsg-1ubuntu1.3",
      "released": "2020-06-17T09:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libvncserver-config",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "0.9.11\u002Bdfsg-1ubuntu1.3",
      "fix": "libvncserver-config 0.9.11\u002Bdfsg-1ubuntu1.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libvncserver-config-0.9.11-dfsg-1ubuntu1.3",
      "released": "2020-06-17T09:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libvncserver1",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "0.9.11\u002Bdfsg-1ubuntu1.3",
      "fix": "libvncserver1 0.9.11\u002Bdfsg-1ubuntu1.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libvncserver1-0.9.11-dfsg-1ubuntu1.3",
      "released": "2020-06-17T09:15:00Z"
    }
  ],
  "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"
  }
}