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Active Directory Federation Services (AD FS) Denial of Service Vulnerability

Type: advisorySource: Official CVE List1 source record

Allocation of resources without limits or throttling in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.

Announced Source revision 1
Original source ↗

CVE-2026-85321

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-85321

Windows Server 2012 R2

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Windows Server 2012 R2 (Server Core installation)

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Windows Server 2016

Source reference: /containers/cna/affected/2/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Windows Server 2016 (Server Core installation)

Source reference: /containers/cna/affected/3/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Windows Server 2019

Source reference: /containers/cna/affected/4/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Windows Server 2019 (Server Core installation)

Source reference: /containers/cna/affected/5/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Windows Server 2022

Source reference: /containers/cna/affected/6/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Windows Server 2025

Source reference: /containers/cna/affected/7/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Windows Server 2025 (Server Core installation)

Source reference: /containers/cna/affected/8/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "Microsoft",
    "product": "Windows Server 2012 R2",
    "versions": [
      {
        "status": "affected",
        "version": "6.3.9600.0",
        "lessThan": "6.3.9600.23470",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows Server 2012 R2 (Server Core installation)",
    "versions": [
      {
        "status": "affected",
        "version": "6.3.9600.0",
        "lessThan": "6.3.9600.23470",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows Server 2016",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.14393.0",
        "lessThan": "10.0.14393.9612",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows Server 2016 (Server Core installation)",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.14393.0",
        "lessThan": "10.0.14393.9612",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows Server 2019",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.17763.0",
        "lessThan": "10.0.17763.9376",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows Server 2019 (Server Core installation)",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.17763.0",
        "lessThan": "10.0.17763.9376",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows Server 2022",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.20348.0",
        "lessThan": "10.0.20348.5761",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows Server 2025",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.26100.0",
        "lessThan": "10.0.26100.33650",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Windows Server 2025 (Server Core installation)",
    "versions": [
      {
        "status": "affected",
        "version": "10.0.26100.0",
        "lessThan": "10.0.26100.33650",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  }
]
Related CVEs
CVE-2026-85321

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#54102 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement