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CVE-2026-77494

HighCVSS 7.5/10Last modified Sep 24, 2026

Description

Access of resource using incompatible type ('type confusion') in Windows DHCP Server allows an unauthorized attacker to deny service over a network.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

Affected software

Vendor	Product	Versions
Microsoft	Windows 10 Version 1607	>= 10.0.14393.0, < 10.0.14393.9512
Microsoft	Windows 10 Version 1809	>= 10.0.17763.0, < 10.0.17763.9245
Microsoft	Windows Server 2012	>= 6.2.9200.0, < 6.2.9200.26349
Microsoft	Windows Server 2012 (Server Core installation)	>= 6.2.9200.0, < 6.2.9200.26349
Microsoft	Windows Server 2012 R2	>= 6.3.9600.0, < 6.3.9600.23398
Microsoft	Windows Server 2012 R2 (Server Core installation)	>= 6.3.9600.0, < 6.3.9600.23398
Microsoft	Windows Server 2016	>= 10.0.14393.0, < 10.0.14393.9512
Microsoft	Windows Server 2016 (Server Core installation)	>= 10.0.14393.0, < 10.0.14393.9512
Microsoft	Windows Server 2019	>= 10.0.17763.0, < 10.0.17763.9245
Microsoft	Windows Server 2019 (Server Core installation)	>= 10.0.17763.0, < 10.0.17763.9245
Microsoft	Windows Server 2022	>= 10.0.20348.0, < 10.0.20348.5622
Microsoft	Windows Server 2025	>= 10.0.26100.0, < 10.0.26100.33438
Microsoft	Windows Server 2025 (Server Core installation)	>= 10.0.26100.0, < 10.0.26100.33438

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77494Patch, Vendor Advisory

Timeline

Published: Sep 8, 2026
Last modified: Sep 24, 2026
NVD status: Analyzed

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CVE-2026-77494: High severity, CVSS 7.5 | Vulnix