High MSRC-CVE-2026-83677 1 CVE

Windows DHCP Client Denial of Service Vulnerability

Published Oct 13, 2026 · Updated Oct 13, 2026

Vendor: Microsoft

Summary

Impact: Denial of Service. Microsoft rating: Important. Not known to be exploited — Exploitation Unlikely. Customer action: Required.

Details

Security updates
10.0.26100.33650 — https://support.microsoft.com/help/5126646
10.0.26200.9711 — https://support.microsoft.com/help/5127648
10.0.28000.3231 — https://support.microsoft.com/help/5127646

Vulnerabilities 1

High 7.5

CVE-2026-83677

Windows DHCP Client Denial of Service Vulnerability

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

Microsoft Windows Server 2025 Windows Server 2025 (Server Core installation) Windows 11 Version 24H2 Windows

Oct 13, 2026

Revision history

2026-10-13 #1
Information published.

References

CVE-2026-83677 Windows DHCP Client Denial of Service Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83677
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss