{
  "cveId": "CVE-2020-16969",
  "url": "https://patchblox.com/security/cve/CVE-2020-16969",
  "summary": "CVE-2020-16969 is fixed in 5 products on 1 platform, first by KB4581424, released October 13, 2020. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Microsoft Exchange Information Disclosure Vulnerability",
  "description": "\u003Cp\u003EAn information disclosure vulnerability exists in how Microsoft Exchange validates tokens when handling certain messages. An attacker who successfully exploited the vulnerability could use this to gain further information from a user.\u003C/p\u003E\n\u003Cp\u003ETo exploit the vulnerability, an attacker could include specially crafted OWA messages that could be loaded, without warning or filtering, from the attacker-controlled URL. This callback vector provides an information disclosure tactic used in web beacons and other types of tracking systems.\u003C/p\u003E\n\u003Cp\u003EThe security update corrects the way that Exchange handles these token validations.\u003C/p\u003E",
  "published": "2020-10-13T07:00:00Z",
  "severity": "Important",
  "cvss": 7.1,
  "epss": 0.0273,
  "epssPercentile": 0.86169,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "exploitabilityAssessment": "Exploitation Less Likely",
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-16969",
  "fixes": [
    {
      "platform": "microsoft",
      "product": "Microsoft Exchange Server 2013 Cumulative Update 23",
      "fixedVersion": "",
      "fix": "KB4581424",
      "url": "https://patchblox.com/security/fix/microsoft/kb4581424",
      "released": "2020-10-13T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft Exchange Server 2016 Cumulative Update 17",
      "fixedVersion": "",
      "fix": "KB4581424",
      "url": "https://patchblox.com/security/fix/microsoft/kb4581424",
      "released": "2020-10-13T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft Exchange Server 2016 Cumulative Update 18",
      "fixedVersion": "",
      "fix": "KB4581424",
      "url": "https://patchblox.com/security/fix/microsoft/kb4581424",
      "released": "2020-10-13T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft Exchange Server 2019 Cumulative Update 6",
      "fixedVersion": "",
      "fix": "KB4581424",
      "url": "https://patchblox.com/security/fix/microsoft/kb4581424",
      "released": "2020-10-13T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft Exchange Server 2019 Cumulative Update 7",
      "fixedVersion": "",
      "fix": "KB4581424",
      "url": "https://patchblox.com/security/fix/microsoft/kb4581424",
      "released": "2020-10-13T07:00:00Z"
    }
  ],
  "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"
  }
}