CVE-2026-24293: CWE-476: NULL Pointer Dereference in Microsoft Windows 10 Version 21H2
Null pointer dereference in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-24293) is a null pointer dereference in the Windows Ancillary Function Driver for WinSock on Windows 10 Version 21H2 (build 10.0.19044.0). It enables an authorized local attacker to elevate privileges on the affected system. The CVSS v3.1 base score is 7.8, indicating high severity, with attack vector local, low attack complexity, and requiring privileges but no user interaction. Microsoft has published an official fix for this vulnerability.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate their privileges, potentially gaining higher system rights and control. The vulnerability affects confidentiality, integrity, and availability with high impact as indicated by the CVSS score.
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-2026-24293 to remediate this vulnerability.
CVE-2026-24293: CWE-476: NULL Pointer Dereference in Microsoft Windows 10 Version 21H2
Description
Null pointer dereference in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
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 2022, 23H2 Edition (Server Core installation)
Microsoft
Windows Server 2025
Microsoft
Windows Server 2025 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-24293) is a null pointer dereference in the Windows Ancillary Function Driver for WinSock on Windows 10 Version 21H2 (build 10.0.19044.0). It enables an authorized local attacker to elevate privileges on the affected system. The CVSS v3.1 base score is 7.8, indicating high severity, with attack vector local, low attack complexity, and requiring privileges but no user interaction. Microsoft has published an official fix for this vulnerability.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate their privileges, potentially gaining higher system rights and control. The vulnerability affects confidentiality, integrity, and availability with high impact as indicated by the CVSS score.
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-2026-24293 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-01-21T21:28:02.968Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-24293","vendor":"Microsoft"}]
Threat ID: 69b0562aea502d3aa87d6987
Added to database: 03/10/2026, 17:34:34 UTC
Last enriched: 06/19/2026, 20:26:49 UTC
Last updated: 09/14/2026, 22:01:32 UTC
Views: 156
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