CVE-2026-85799: CWE-416: Use After Free in Microsoft Windows 10 Version 1607
Description
CVE-2026-85799 is a use-after-free vulnerability in the Network Policy Server (NPS) component of Microsoft Windows 10 Version 1607 and related builds. This flaw allows an unauthorized attacker to execute code remotely over a network. The vulnerability has a high severity with a CVSS score of 8.1. Microsoft has released an official fix for this issue.
CVSS v3.1
Score 8.1high
Affected software
Microsoft
Windows 10 Version 1607
Microsoft
Windows 10 Version 1809
Microsoft
Windows 10 Version 21H2
Microsoft
Windows 10 Version 22H2
Microsoft
Windows 11 version 23H2
Microsoft
Windows 11 Version 23H2
Microsoft
Windows 11 Version 24H2
Microsoft
Windows 11 Version 25H2
Microsoft
Windows 11 version 26H1
Microsoft
Windows 11 Version 26H2
Microsoft
Windows Server 2012
Microsoft
Windows Server 2012 (Server Core installation)
Microsoft
Windows Server 2012 R2
Microsoft
Windows Server 2012 R2 (Server Core installation)
Microsoft
Windows Server 2016
Microsoft
Windows Server 2016 (Server Core installation)
Microsoft
Windows Server 2019
Microsoft
Windows Server 2019 (Server Core installation)
Microsoft
Windows Server 2022
Microsoft
Windows Server 2025
Microsoft
Windows Server 2025 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, tracked as CVE-2026-85799, involves a use-after-free condition in the Network Policy Server (NPS) on Microsoft Windows 10 Version 1607 and other specified builds. An attacker can exploit this flaw remotely without user interaction to execute arbitrary code, potentially leading to full system compromise. The vulnerability is rated high severity with a CVSS 3.1 base score of 8.1, reflecting network attack vector, high impact on confidentiality, integrity, and availability, and requiring no privileges or user interaction. Microsoft has published an official security update addressing this issue.
Potential Impact
Successful exploitation allows an unauthorized attacker to execute arbitrary code remotely on affected systems, potentially leading to complete compromise of confidentiality, integrity, and availability of the system.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. It is strongly recommended to apply the security updates provided by Microsoft as detailed in their advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85799. No additional mitigation steps are indicated beyond applying the official patch.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-09-04T18:08:54.993Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85799","vendor":"Microsoft"}]
Threat ID: 6ace853c2cdf04f6569fe848
Added to database: 10/13/2026, 19:23:40 UTC
Last enriched: 10/14/2026, 03:35:10 UTC
Last updated: 10/14/2026, 03:35:10 UTC
Views: 2
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.