CVE-2026-21245: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 11 Version 24H2
Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability involves a heap-based buffer overflow in the Windows Kernel component of Windows 11 Version 24H2 (build 10.0.26100.0). It enables an attacker with local authorized access to escalate privileges, potentially gaining higher system rights. The CVSS 3.1 vector indicates low attack complexity and privileges required, no user interaction, and high impact on confidentiality, integrity, and availability. Microsoft has published an official fix to remediate this vulnerability.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges, potentially leading to full system compromise. The vulnerability affects confidentiality, integrity, and availability of 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 update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21245 to remediate this vulnerability.
CVE-2026-21245: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 11 Version 24H2
Description
Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a heap-based buffer overflow in the Windows Kernel component of Windows 11 Version 24H2 (build 10.0.26100.0). It enables an attacker with local authorized access to escalate privileges, potentially gaining higher system rights. The CVSS 3.1 vector indicates low attack complexity and privileges required, no user interaction, and high impact on confidentiality, integrity, and availability. Microsoft has published an official fix to remediate this vulnerability.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges, potentially leading to full system compromise. The vulnerability affects confidentiality, integrity, and availability of 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 update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21245 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-11T21:02:05.735Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21245","vendor":"Microsoft"}]
Threat ID: 698b76004b57a58fa120a015
Added to database: 2/10/2026, 6:16:32 PM
Last enriched: 5/12/2026, 5:12:14 AM
Last updated: 5/22/2026, 1:52:13 PM
Views: 171
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