CVE-2026-69631: CWE-190: Integer Overflow or Wraparound in Microsoft Windows 10 Version 1607
Description
CVE-2026-69631 is an integer overflow or wraparound vulnerability in the Windows DNS component affecting multiple versions of Microsoft Windows including Windows 10 Version 1607. This vulnerability allows an unauthorized attacker to cause a denial of service over a network. The issue has a high severity rating with a CVSS score of 7.5. An official fix is available from Microsoft.
CVSS v3.1
Score 7.5high
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
CVE-2026-69631 is a vulnerability classified as CWE-190 (Integer Overflow or Wraparound) in the Windows DNS component. It affects several versions of Microsoft Windows, including Windows 10 Version 1607 and other specified builds. The flaw allows an attacker without privileges or user interaction to cause a denial of service condition remotely by exploiting an integer overflow or wraparound. The vulnerability has been assigned a CVSS 3.1 base score of 7.5, indicating high severity. Microsoft has released an official fix for this vulnerability.
Potential Impact
An attacker can exploit this vulnerability to cause a denial of service (DoS) on affected Windows systems remotely without requiring privileges or user interaction. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security updates provided by Microsoft for the affected Windows versions as listed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69631. No additional mitigation steps are required beyond applying the official patch.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-03T21:24:59.407Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69631","vendor":"Microsoft"}]
Threat ID: 6aa0451aacd9273b49fa9772
Added to database: 09/08/2026, 17:25:46 UTC
Last enriched: 10/16/2026, 21:26:06 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 43
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