CVE-2026-69551: CWE-416: Use After Free in Microsoft Windows 10 Version 1607
Description
CVE-2026-69551 is a use-after-free vulnerability in the Windows DNS component affecting multiple versions of Microsoft Windows including Windows 10 Version 1607. This flaw allows an authorized attacker to execute code remotely over a network. The vulnerability has a high severity with a CVSS score of 8.8. Microsoft has released an official fix addressing this issue.
CVSS v3.1
Score 8.8high
Affected software
Microsoft
Windows 10 Version 1607
Microsoft
Windows 10 Version 1809
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 (CVE-2026-69551) involves a use-after-free condition in the Windows DNS service. An authorized attacker can exploit this flaw remotely to execute arbitrary code on affected systems. The vulnerability affects several Windows versions, including Windows 10 Version 1607 and others, within specific build ranges. The CVSS 3.1 base score is 8.8, indicating a high severity with network attack vector, low attack complexity, and no user interaction required. Microsoft has published an official fix for this vulnerability.
Potential Impact
Successful exploitation allows an authorized attacker to execute arbitrary code remotely, potentially leading to full compromise of the affected system. The vulnerability impacts confidentiality, integrity, and availability with high impact ratings. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix from Microsoft is available and should be applied promptly to affected systems. Refer to the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69551 for update details and installation instructions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-03T21:15:56.834Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69551","vendor":"Microsoft"}]
Threat ID: 6aa0450dacd9273b49fa8c07
Added to database: 09/08/2026, 17:25:33 UTC
Last enriched: 10/16/2026, 21:20:50 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 23
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.