{
  "cveId": "CVE-2018-8340",
  "url": "https://patchblox.com/security/cve/CVE-2018-8340",
  "summary": "CVE-2018-8340 is fixed in 6 products on 1 platform, first by KB4343887, released August 14, 2018. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "ADFS Security Feature Bypass Vulnerability",
  "description": "\u003Cp\u003EA security feature bypass vulnerability exists when Active Directory Federation Services (ADFS) improperly handles multi-factor authentication requests.\u003C/p\u003E\n\u003Cp\u003ETo exploit this vulnerability, an attacker could send a specially crafted authentication request. An attacker who successfully exploited this vulnerability could bypass some, but not all, of the authentication factors.\u003C/p\u003E\n\u003Cp\u003EThis security update corrects how ADFS handles multi-factor authentication requests.\u003C/p\u003E",
  "published": "2018-08-14T07:00:00Z",
  "severity": "Important",
  "cvss": 6.5,
  "epss": 0.07887,
  "epssPercentile": 0.94736,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "exploitabilityAssessment": "Exploitation Less Likely",
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-8340",
  "fixes": [
    {
      "platform": "microsoft",
      "product": "Windows Server 2012 R2",
      "fixedVersion": "",
      "fix": "KB4343888",
      "url": "https://patchblox.com/security/fix/microsoft/kb4343888",
      "released": "2018-08-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012 R2",
      "fixedVersion": "",
      "fix": "KB4343898",
      "url": "https://patchblox.com/security/fix/microsoft/kb4343898",
      "released": "2018-08-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012 R2 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB4343888",
      "url": "https://patchblox.com/security/fix/microsoft/kb4343888",
      "released": "2018-08-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012 R2 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB4343898",
      "url": "https://patchblox.com/security/fix/microsoft/kb4343898",
      "released": "2018-08-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2016",
      "fixedVersion": "14393.2430",
      "fix": "KB4343887",
      "url": "https://patchblox.com/security/fix/microsoft/kb4343887",
      "released": "2018-08-14T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2016 (Server Core installation)",
      "fixedVersion": "14393.2430",
      "fix": "KB4343887",
      "url": "https://patchblox.com/security/fix/microsoft/kb4343887",
      "released": "2018-08-14T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server, version 1709  (Server Core Installation)",
      "fixedVersion": "16299.611",
      "fix": "KB4343897",
      "url": "https://patchblox.com/security/fix/microsoft/kb4343897",
      "released": "2018-08-14T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server, version 1803  (Server Core Installation)",
      "fixedVersion": "17134.228",
      "fix": "KB4343909",
      "url": "https://patchblox.com/security/fix/microsoft/kb4343909",
      "released": "2018-08-14T00:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-07T06:34:28Z"
}