CVE-2026-69535: CWE-197: Numeric Truncation Error in Microsoft Windows 10 Version 21H2
Description
CVE-2026-69535 is a numeric truncation error vulnerability in the Windows Spaceport.sys driver affecting Windows 10 Version 21H2. It allows an authorized local attacker to elevate privileges. The vulnerability has a high severity score of 7.8 and has been officially fixed by Microsoft.
CVSS v3.1
Score 7.8high
Affected software
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 2022
Microsoft
Windows Server 2025
Microsoft
Windows Server 2025 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CVE-2026-69535, involves a numeric truncation error in the Windows Spaceport.sys driver component of Windows 10 Version 21H2. An authorized local attacker can exploit this flaw to elevate privileges on the affected system. The issue is tracked under CWE-197 (Numeric Truncation Error). Microsoft has published an official fix addressing this vulnerability.
Potential Impact
Successful exploitation of this vulnerability allows an authorized local attacker to gain elevated privileges, potentially leading to full system compromise. The CVSS v3.1 base score is 7.8 (high), reflecting high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security updates provided by Microsoft as detailed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69535 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-03T21:12:04.477Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69535","vendor":"Microsoft"}]
Threat ID: 6aa04509acd9273b49fa8bad
Added to database: 09/08/2026, 17:25:29 UTC
Last enriched: 10/16/2026, 21:19:42 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 42
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.