CVE-2026-71345: CWE-787: Out-of-bounds Write in Microsoft Windows 10 Version 1607
Description
CVE-2026-71345 is a high-severity vulnerability in Microsoft Windows 10 Version 1607 and other specified versions. It involves an out-of-bounds write flaw in the Spaceport.sys component, which could allow an authorized local attacker to execute code. The vulnerability affects multiple Windows 10 builds and some earlier Windows versions. An official fix is available from Microsoft.
CVSS v3.1
Score 7.8high
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 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-2026-71345) is an out-of-bounds write issue in the Windows kernel driver Spaceport.sys. It allows an attacker with local authorized access to execute arbitrary code on the affected system. The flaw impacts various Windows 10 versions starting from build 14393.0 up to but excluding specific patched builds (e.g., <10.0.14393.9512). The CVSS 3.1 base score is 7.8, indicating high severity with high impact on confidentiality, integrity, and availability. Microsoft has published an official fix for this vulnerability.
Potential Impact
Successful exploitation can lead to local code execution with elevated privileges, potentially compromising system confidentiality, integrity, and availability. The attacker must have authorized local access to the system. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security updates provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-71345 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-05T18:41:50.335Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-71345","vendor":"Microsoft"}]
Threat ID: 6aa04540acd9273b49fa9c45
Added to database: 09/08/2026, 17:26:24 UTC
Last enriched: 10/16/2026, 21:43:52 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 27
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