CVE-2026-71348: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1607
Description
CVE-2026-71348 is a heap-based buffer overflow vulnerability in the Windows Spaceport.sys driver affecting multiple versions of Microsoft Windows 10, including Version 1607 and later builds. This flaw allows an unauthorized attacker with physical access to execute arbitrary code on the affected system. The vulnerability has a CVSS 3.1 base score of 6.8, indicating a medium severity level. An official fix is available from Microsoft.
CVSS v3.1
Score 6.8medium
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-2026-71348) involves a heap-based buffer overflow in the Windows Spaceport.sys component. Exploitation requires physical access and can lead to arbitrary code execution with high impact on confidentiality, integrity, and availability. Multiple Windows 10 versions are affected, specifically builds from 10.0.14393.0 up to but not including 10.0.14393.9512, and other specified build ranges. Microsoft has published an official fix addressing this issue.
Potential Impact
Successful exploitation allows an attacker with physical access to execute arbitrary code on the vulnerable system, potentially leading to full compromise of confidentiality, integrity, and availability of the affected Windows 10 installations. The CVSS score of 6.8 reflects medium severity due to the physical access requirement and the significant impact of code execution.
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-2026-71348 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-2026-71348","vendor":"Microsoft"}]
Threat ID: 6aa04540acd9273b49fa9c47
Added to database: 09/08/2026, 17:26:24 UTC
Last enriched: 10/16/2026, 21:43:56 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 28
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.