{
  "cveId": "CVE-2017-0021",
  "url": "https://patchblox.com/security/cve/CVE-2017-0021",
  "summary": "CVE-2017-0021 is fixed in 4 products on 1 platform, first by KB4013429, released March 14, 2017. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "Hyper-V vSMB Remote Code Execution Vulnerability",
  "description": "\u003Cp\u003EA remote code execution vulnerability exists when Windows Hyper-V on a host server fails to properly validate vSMB packet data. An attacker who successfully exploited these vulnerabilities could execute arbitrary code on a target operating system.\u003C/p\u003E\n\u003Cp\u003ETo exploit these vulnerabilities, an attacker running inside a virtual machine could run a specially crafted application that could cause the Hyper-V host operating system to execute arbitrary code.\u003C/p\u003E\n\u003Cp\u003EThe update addresses the vulnerabilities by correcting how Windows Hyper-V validates vSMB packet data.\u003C/p\u003E",
  "published": "2017-03-14T12:00:00Z",
  "severity": "Critical",
  "cvss": 4.3,
  "epss": 0.01776,
  "epssPercentile": 0.78337,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "exploitabilityAssessment": "Exploitation Less Likely",
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2017-0021",
  "fixes": [
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1607 for 32-bit Systems",
      "fixedVersion": "14393.953",
      "fix": "KB4013429",
      "url": "https://patchblox.com/security/fix/microsoft/kb4013429",
      "released": "2017-03-14T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1607 for x64-based Systems",
      "fixedVersion": "14393.953",
      "fix": "KB4013429",
      "url": "https://patchblox.com/security/fix/microsoft/kb4013429",
      "released": "2017-03-14T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2016",
      "fixedVersion": "14393.953",
      "fix": "KB4013429",
      "url": "https://patchblox.com/security/fix/microsoft/kb4013429",
      "released": "2017-03-14T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2016 (Server Core installation)",
      "fixedVersion": "14393.953",
      "fix": "KB4013429",
      "url": "https://patchblox.com/security/fix/microsoft/kb4013429",
      "released": "2017-03-14T00:00:00Z"
    }
  ],
  "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"
  }
}