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.
Other sources
Windows DHCP Client Denial of Service Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26300.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.3231Patch KB5127646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.9711Patch KB5127648
Event History
Frequently Asked Questions
Which systems are in scope?
The affected software listed is Microsoft Windows 11 and Microsoft Windows Server 2025.
Does exploitation require credentials or user interaction?
No. The vector is network-based, with low attack complexity, no privileges required, and no user interaction required.
What is the expected security impact?
The stated impact is denial of service. Confidentiality and integrity impacts are rated as none, while availability impact is high.
What flaw is being exploited?
The issue is a missing release of memory after its effective lifetime in the Windows DHCP Client.