CVE-2026-85324

Analyzed Analyzed - Analysis Complete

Memory Exhaustion in Active Directory Federation Services

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Memory allocation with excessive size value in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-16

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-85324

EUVD

EUVD-2026-99464

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_server_2016	to 10.0.14393.9612 (exc)
microsoft	windows_server_2019	to 10.0.17763.9376 (exc)
microsoft	windows_server_2025	to 10.0.26100.33650 (exc)
microsoft	windows_server_2022	to 10.0.20348.5761 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-789	The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.

Attack-Flow Graph

Executive Summary

This vulnerability involves memory allocation with an excessively large size value in Active Directory Federation Services (AD FS). An unauthorized attacker can exploit this to cause a denial of service over a network.

Impact Analysis

An attacker could exploit this flaw to disrupt services, causing downtime for systems relying on AD FS. This may lead to loss of access to critical network resources or applications.

Compliance Impact

This vulnerability allows an unauthorized attacker to deny service over a network by exploiting memory allocation issues in AD FS. This could lead to system unavailability, which may impact compliance with regulations requiring data availability and access controls, such as GDPR and HIPAA.

Mitigation Strategies

Apply the latest security updates from Microsoft for AD FS to address the memory allocation issue. Monitor network traffic for unusual patterns that may indicate denial of service attempts targeting AD FS services.

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