CVE-2026-85321
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Allocation of Resources Without Limits in Active Directory Federation Services

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Microsoft Corporation

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

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Meta Information

Published
2026-10-13
Last Modified
2026-10-13
Generated
2026-10-19
AI Q&A
2026-10-14
EPSS Evaluated
2026-10-18
NVD
CVE-2026-85321
EUVD
EUVD-2026-99461

Affected Vendors & Products

Showing 9 associated CPEs
Vendor Product Version / Range
Microsoft Windows Server 2012 R2 6.3.9600.0
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0
Microsoft Windows Server 2016 10.0.14393.0
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0
Microsoft Windows Server 2019 10.0.17763.0
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0
Microsoft Windows Server 2022 10.0.20348.0
Microsoft Windows Server 2025 10.0.26100.0
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-770 The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

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Executive Summary

This vulnerability involves Active Directory Federation Services (AD FS) not properly limiting or throttling resource allocation. An unauthorized attacker can exploit this to send excessive requests, causing a denial of service over the network.

Impact Analysis

An attacker could disrupt services by overwhelming AD FS with requests, leading to service unavailability for legitimate users. This may cause downtime for authentication and identity management services.

Compliance Impact

This vulnerability allows unauthorized denial of service attacks on AD FS, which could disrupt authentication and authorization services. Such disruptions may impact compliance with GDPR (availability requirements) and HIPAA (access control and system availability).

Mitigation Strategies

Apply the latest security updates from Microsoft for AD FS to address the resource allocation issue. Monitor network traffic for unusual patterns indicating a denial of service attempt. Ensure AD FS servers are not exposed to untrusted networks without proper protections.

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