---
id: CVE-2026-83645
title: >-
  Allocation of resources without limits or throttling in Active Directory
  Federation Services (AD FS) allows an unauthorized attacker to deny service
  over a network.
summary: >-
  Allocation of resources without limits or throttling in Active Directory
  Federation Services (AD FS) allows an unauthorized attacker to deny service
  over a network.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-770
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T21:18:30.667'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-83645'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83645'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-13T19:43:29.074Z'
vendor: Microsoft
product: Windows 10 Version 1607
affected:
  - windows_10_version_1607 >= 10.0.14393.0 < 10.0.14393.9612
  - windows_10_version_1809 >= 10.0.17763.0 < 10.0.17763.9376
  - windows_server_2012 >= 6.2.9200.0 < 6.2.9200.26434
  - windows_server_2012_server_core_installation >= 6.2.9200.0 < 6.2.9200.26434
  - windows_server_2012_r2 >= 6.3.9600.0 < 6.3.9600.23470
  - >-
    windows_server_2012_r2_server_core_installation >= 6.3.9600.0 <
    6.3.9600.23470
  - windows_server_2016 >= 10.0.14393.0 < 10.0.14393.9612
  - >-
    windows_server_2016_server_core_installation >= 10.0.14393.0 <
    10.0.14393.9612
  - windows_server_2019 >= 10.0.17763.0 < 10.0.17763.9376
  - >-
    windows_server_2019_server_core_installation >= 10.0.17763.0 <
    10.0.17763.9376
  - windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5761
  - windows_server_2025 >= 10.0.26100.0 < 10.0.26100.33650
  - >-
    windows_server_2025_server_core_installation >= 10.0.26100.0 <
    10.0.26100.33650
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-13T20:38:23.421655Z'
epss: 0.01249
epssPercentile: 0.69211
---

## Overview

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

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.