CVE-2026-56168: CWE-476: NULL Pointer Dereference in Microsoft Windows 10 Version 21H2
Null pointer dereference in Windows SMB Server allows an authorized attacker to deny service over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-56168) involves a null pointer dereference in the Windows SMB Server on Windows 10 Version 21H2 (build 10.0.19044.0). An attacker with authorized access can exploit this flaw to cause a denial of service condition, disrupting network services. The vulnerability has a CVSS 3.1 base score of 6.5, indicating a medium severity level. Microsoft has released an official fix for this issue, as documented in their security update guide.
Potential Impact
An authorized attacker can exploit this vulnerability to cause a denial of service on affected Windows 10 Version 21H2 systems by triggering a null pointer dereference in the SMB Server. This results in service disruption but does not impact confidentiality or integrity.
Mitigation Recommendations
An official fix is available from Microsoft. It is recommended to apply the security update provided by Microsoft for Windows 10 Version 21H2 (build 10.0.19044.0) to remediate this vulnerability. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56168 for update details.
CVE-2026-56168: CWE-476: NULL Pointer Dereference in Microsoft Windows 10 Version 21H2
Description
Null pointer dereference in Windows SMB Server allows an authorized attacker to deny service over a network.
CVSS v3.1
Score 6.5medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-56168) involves a null pointer dereference in the Windows SMB Server on Windows 10 Version 21H2 (build 10.0.19044.0). An attacker with authorized access can exploit this flaw to cause a denial of service condition, disrupting network services. The vulnerability has a CVSS 3.1 base score of 6.5, indicating a medium severity level. Microsoft has released an official fix for this issue, as documented in their security update guide.
Potential Impact
An authorized attacker can exploit this vulnerability to cause a denial of service on affected Windows 10 Version 21H2 systems by triggering a null pointer dereference in the SMB Server. This results in service disruption but does not impact confidentiality or integrity.
Mitigation Recommendations
An official fix is available from Microsoft. It is recommended to apply the security update provided by Microsoft for Windows 10 Version 21H2 (build 10.0.19044.0) to remediate this vulnerability. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56168 for update details.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-19T13:53:31.989Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56168","vendor":"Microsoft"}]
Threat ID: 6a5676b968715ace43f0ae2d
Added to database: 07/14/2026, 17:49:45 UTC
Last enriched: 08/13/2026, 15:45:35 UTC
Last updated: 08/25/2026, 22:52:12 UTC
Views: 42
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