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CVE-2026-85321— Active Directory Federation Services (AD FS) Denial of Service Vulnerability

Quick assessment

Affected
Microsoft Windows Server 2012 R2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Active Directory 联合服务（AD FS）中，对资源的分配缺乏限制或流量控制，使得未经授权的攻击者能够通过网络实施拒绝服务攻击。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 9

VendorProduct Version RangeStatus
Microsoft Windows Server 2012 R2 6.3.9600.0< 6.3.9600.23470 affected
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0< 6.3.9600.23470 affected
Microsoft Windows Server 2016 10.0.14393.0< 10.0.14393.9612 affected
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0< 10.0.14393.9612 affected
Microsoft Windows Server 2019 10.0.17763.0< 10.0.17763.9376 affected
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0< 10.0.17763.9376 affected
Microsoft Windows Server 2022 10.0.20348.0< 10.0.20348.5761 affected
Microsoft Windows Server 2025 10.0.26100.0< 10.0.26100.33650 affected
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0< 10.0.26100.33650 affected
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I. Basic Information for CVE-2026-85321

Vulnerability Information
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Vulnerability Title
Active Directory Federation Services (AD FS) Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Windows Server 2012 R2 6.3.9600.0 ~ 6.3.9600.23470 -
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 ~ 6.3.9600.23470 -
Microsoft Windows Server 2016 10.0.14393.0 ~ 10.0.14393.9612 -
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0 ~ 10.0.14393.9612 -
Microsoft Windows Server 2019 10.0.17763.0 ~ 10.0.17763.9376 -
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0 ~ 10.0.17763.9376 -
Microsoft Windows Server 2022 10.0.20348.0 ~ 10.0.20348.5761 -
Microsoft Windows Server 2025 10.0.26100.0 ~ 10.0.26100.33650 -
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0 ~ 10.0.26100.33650 -

II. Public POCs for CVE-2026-85321

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III. Intelligence Information for CVE-2026-85321

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Vendor Advisories for CVE-2026-85321 (1)

Same Patch Batch · Microsoft · 2026-10-13 · 1407 CVEs total

CVE-2026-96113 9.8 CRITICAL Windows Domain Name Service Remote Code Execution Vulnerability
CVE-2026-88156 9.8 CRITICAL Microsoft Office Outlook Remote Code Execution Vulnerability
CVE-2026-88178 9.8 CRITICAL Microsoft Office PowerPoint Remote Code Execution Vulnerability
CVE-2026-96219 9.8 CRITICAL Windows Local Security Authority Subsystem Service (LSASS) Remote Code Execution Vulnerabi
CVE-2026-83862 9.8 CRITICAL Windows Network Load Balancing Remote Code Execution Vulnerability
CVE-2026-85814 9.8 CRITICAL Microsoft Windows Media Foundation Remote Code Execution Vulnerability
CVE-2026-85809 9.8 CRITICAL Windows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
CVE-2026-85806 9.8 CRITICAL Network Policy Server (NPS) Remote Code Execution Vulnerability
CVE-2026-96864 9.8 CRITICAL Microsoft Failover Cluster Virtual Driver Remote Code Execution Vulnerability
CVE-2026-97749 9.8 CRITICAL Microsoft Office Outlook Remote Code Execution Vulnerability
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CVE-2026-97016 9.8 CRITICAL Microsoft Office Outlook Remote Code Execution Vulnerability
CVE-2026-97816 9.8 CRITICAL Microsoft OpenSSH for Windows Remote Code Execution Vulnerability
CVE-2026-70242 9.8 CRITICAL Microsoft Office Outlook Remote Code Execution Vulnerability
CVE-2026-70153 9.8 CRITICAL Microsoft PostScript Printer Driver Remote Code Execution Vulnerability
CVE-2026-97814 9.8 CRITICAL Windows Text Shaping Remote Code Execution Vulnerability
CVE-2026-100219 9.8 CRITICAL Microsoft QUIC Remote Code Execution Vulnerability
CVE-2026-97815 9.8 CRITICAL Windows Error Reporting Remote Code Execution Vulnerability
CVE-2026-69639 9.8 CRITICAL Windows libarchive Remote Code Execution Vulnerability
CVE-2026-84015 9.8 CRITICAL Remote Access Point-to-Point Protocol (PPP) EAP-TLS Remote Code Execution Vulnerability

Showing top 20 of 1407 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Windows Server 2012 R2
Same vendor: Microsoft
Same weakness: CWE-770

V. Comments for CVE-2026-85321

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