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CVE-2026-69777

HighCVSS 8.0/10Last modified Sep 11, 2026

Description

Heap-based buffer overflow in Windows DHCP Client allows an authorized attacker to elevate privileges over an adjacent network.

Metrics

CVSS 3.1 8.0/10CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

Affected software

Vendor	Product	Versions
Microsoft	Windows 11 Version 24H2	>= 10.0.26100.0, < 10.0.26100.9445
Microsoft	Windows 11 Version 25H2	>= 10.0.26200.0, < 10.0.26200.9445
Microsoft	Windows 11 version 26H1	>= 10.0.28000.0, < 10.0.28000.2954

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69777Patch, Vendor Advisory

Timeline

Published: Sep 8, 2026
Last modified: Sep 11, 2026
NVD status: Analyzed

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CVE-2026-69777: High severity, CVSS 8.0 | Vulnix