{
  "cveId": "CVE-2017-8621",
  "url": "https://patchblox.com/security/cve/CVE-2017-8621",
  "summary": "CVE-2017-8621 is fixed in 4 products on 1 platform, first by KB4018588, released July 11, 2017. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "Microsoft Exchange Open Redirect Vulnerability",
  "description": "\u003Cp\u003EAn open redirect vulnerability exists in Microsoft Exchange that could lead to spoofing.\u003C/p\u003E\n\u003Cp\u003ETo exploit the vulnerability, an attacker could send a link that has a specially crafted URL, and convince the user to click the link. When an authenticated Exchange user clicks the link, the authenticated user\u0027s browser session could be redirected to a malicious site that is designed to impersonate a legitimate website. By doing so, the attacker could trick the user and potentially acquire sensitive information, such as the user\u0027s credentials.\u003C/p\u003E\n\u003Cp\u003EThe update addresses the vulnerability by correcting how Exchange handles open redirect requests.\u003C/p\u003E",
  "published": "2017-07-11T07:00:00Z",
  "severity": "Moderate",
  "epss": 0.0317,
  "epssPercentile": 0.88084,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "exploitabilityAssessment": "Exploitation Unlikely",
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2017-8621",
  "fixes": [
    {
      "platform": "microsoft",
      "product": "Microsoft Exchange Server 2010 Service Pack 3",
      "fixedVersion": "",
      "fix": "KB4018588",
      "url": "https://patchblox.com/security/fix/microsoft/kb4018588",
      "released": "2017-07-11T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft Exchange Server 2013 Cumulative Update 16",
      "fixedVersion": "",
      "fix": "KB4018588",
      "url": "https://patchblox.com/security/fix/microsoft/kb4018588",
      "released": "2017-07-11T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft Exchange Server 2013 Service Pack 1",
      "fixedVersion": "",
      "fix": "KB4018588",
      "url": "https://patchblox.com/security/fix/microsoft/kb4018588",
      "released": "2017-07-11T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft Exchange Server 2016 Cumulative Update 5",
      "fixedVersion": "",
      "fix": "KB4018588",
      "url": "https://patchblox.com/security/fix/microsoft/kb4018588",
      "released": "2017-07-11T07:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-07T12:40:37Z"
}