CVE-2026-77888: CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') in Microsoft Windows 10 Version 1607
Description
Access of resource using incompatible type ('type confusion') in Windows DHCP Server allows an unauthorized attacker to deny service over a network.
CVSS v3.1
Score 7.5high
Affected software
Microsoft
Windows 10 Version 1607
Microsoft
Windows 10 Version 1809
Microsoft
Windows Server 2012
Microsoft
Windows Server 2012 (Server Core installation)
Microsoft
Windows Server 2012 R2
Microsoft
Windows Server 2012 R2 (Server Core installation)
Microsoft
Windows Server 2016
Microsoft
Windows Server 2016 (Server Core installation)
Microsoft
Windows Server 2019
Microsoft
Windows Server 2019 (Server Core installation)
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
CVE-2026-77888 is a type confusion vulnerability (CWE-843) in the Windows DHCP Server component affecting multiple versions of Microsoft Windows 10 and Windows Server. The flaw allows an attacker without privileges or user interaction to cause a denial of service condition remotely by accessing resources using incompatible types. The vulnerability has a CVSS 3.1 base score of 7.5, indicating high severity, and Microsoft has issued an official fix to address the issue.
Potential Impact
An attacker can remotely cause a denial of service on affected Windows systems by exploiting the type confusion vulnerability in the DHCP Server. This results in service disruption but does not impact confidentiality or integrity according to the CVSS vector.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. Users and administrators should apply the security updates provided by Microsoft to affected Windows versions to remediate the issue. No additional mitigation actions are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-21T17:26:55.611Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77888","vendor":"Microsoft"}]
Threat ID: 6aa04559acd9273b49fa9fd6
Added to database: 09/08/2026, 17:26:49 UTC
Last enriched: 10/14/2026, 21:57:58 UTC
Last updated: 10/23/2026, 15:10:15 UTC
Views: 35
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