{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2020-17049",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2020-17049",
    "idYear": 2020,
    "status": "PUBLISHED",
    "publishedAt": "2020-11-11T00:00:00.000Z",
    "updatedAt": "2024-11-15T16:12:52.309Z",
    "importedAt": "2026-10-24T01:56:17.081Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "Kerberos KDC Security Feature Bypass Vulnerability",
      "summary": "A security feature bypass vulnerability exists in the way Key Distribution Center (KDC) determines if a service ticket can be used for delegation via Kerberos Constrained Delegation (KCD).\nTo exploit the vulnerability, a compromised service that is configured to use KCD could tamper with a service ticket that is not valid for delegation to force the KDC to accept it.\nThe update addresses this vulnerability by changing how the KDC validates service tickets used with KCD.",
      "affected": [
        {
          "vendor": "Microsoft",
          "product": "Windows Server 2019",
          "platforms": [
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "10.0.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "10.0.17763.2061"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server 2019 (Server Core installation)",
          "platforms": [
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "10.0.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "10.0.17763.2061"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server, version 1909 (Server Core installation)",
          "platforms": [
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "10.0.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "publication"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server, version 1903 (Server Core installation)",
          "platforms": [
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "10.0.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "publication"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server version 2004",
          "platforms": [
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "10.0.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "10.0.19041.1110"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server 2016",
          "platforms": [
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "10.0.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "10.0.14393.4530"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server 2016 (Server Core installation)",
          "platforms": [
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "10.0.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "10.0.14393.4530"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server 2008 Service Pack 2",
          "platforms": [
            "32-bit Systems"
          ],
          "versions": [
            {
              "version": "6.0.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "6.0.6003.21167"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server 2008 Service Pack 2 (Server Core installation)",
          "platforms": [
            "32-bit Systems",
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "6.0.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "6.0.6003.21167"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server 2008  Service Pack 2",
          "platforms": [
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "6.0.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "6.0.6003.21167"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server 2008 R2 Service Pack 1",
          "platforms": [
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "6.1.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "6.1.7601.25661"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server 2008 R2 Service Pack 1 (Server Core installation)",
          "platforms": [
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "6.0.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "6.1.7601.25661"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server 2012",
          "platforms": [
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "6.2.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "6.2.9200.23409"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server 2012 (Server Core installation)",
          "platforms": [
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "6.2.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "6.2.9200.23409"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server 2012 R2",
          "platforms": [
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "6.3.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "6.3.9600.20069"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server 2012 R2 (Server Core installation)",
          "platforms": [
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "6.3.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "6.3.9600.20069"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server version 20H2",
          "platforms": [
            "x64-based Systems"
          ],
          "versions": [
            {
              "version": "10.0.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "10.0.19041.1110"
            }
          ]
        }
      ]
    }
  }
}