CVE-2026-83677

Windows DHCP Client Denial of Service Vulnerability

State: Published
Severity: 7.5 High
Published: Oct 13, 2026
Updated: Oct 31, 2026
Reserved: Aug 31, 2026

Description

Missing release of memory after effective lifetime in Windows DHCP Client allows an unauthorized attacker to deny service over a network.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-401 Missing Release of Memory after Effective Lifetime

Affected Products

Product	Versions
Windows 11 Version 24H2Microsoft	10.0.26100.0 to before 10.0.26100.9711Affected
Windows 11 Version 25H2Microsoft	10.0.26200.0 to before 10.0.26200.9711Affected
Windows 11 version 26H1Microsoft	10.0.28000.0 to before 10.0.28000.3231Affected
Windows 11 Version 26H2Microsoft	10.0.26300.0 to before 10.0.26300.9711Affected
Windows Server 2025Microsoft	10.0.26100.0 to before 10.0.26100.33650Affected
Windows Server 2025 (Server Core installation)Microsoft	10.0.26100.0 to before 10.0.26100.33650Affected

References

Windows DHCP Client Denial of Service Vulnerabilityvendor-advisorypatch

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