CVE-2026-21248: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1607
Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-21248) involves a heap-based buffer overflow in the Windows Hyper-V component of Windows 10 Version 1607 (build 10.0.14393.0). An attacker with local privileges and limited user interaction can exploit this flaw to execute arbitrary code on the affected system. The CVSS 3.1 base score is 7.3, reflecting high impact on confidentiality, integrity, and availability. Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation allows an authorized local attacker to execute arbitrary code, potentially leading to full system compromise including unauthorized disclosure, modification, or destruction of data and disruption of system availability. 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 update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21248 to remediate this vulnerability.
CVE-2026-21248: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1607
Description
Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-21248) involves a heap-based buffer overflow in the Windows Hyper-V component of Windows 10 Version 1607 (build 10.0.14393.0). An attacker with local privileges and limited user interaction can exploit this flaw to execute arbitrary code on the affected system. The CVSS 3.1 base score is 7.3, reflecting high impact on confidentiality, integrity, and availability. Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation allows an authorized local attacker to execute arbitrary code, potentially leading to full system compromise including unauthorized disclosure, modification, or destruction of data and disruption of system availability. 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 update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21248 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-11T21:02:05.736Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21248","vendor":"Microsoft"}]
Threat ID: 698b76004b57a58fa120a022
Added to database: 2/10/2026, 6:16:32 PM
Last enriched: 5/12/2026, 5:12:36 AM
Last updated: 5/22/2026, 7:12:15 PM
Views: 123
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