CVE-2026-83665: Windows DHCP Server Denial of Service Vulnerability
Null pointer dereference in Windows DHCP Server allows an unauthorized attacker to deny service over a network.
Other sources
Windows DHCP Server 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 10.0.14393.9612Patch KB5126868 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.2.9200.26434Patch KB5126835 - 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 10.0.20348.5761Patch KB5126655 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.3.9600.23470Patch KB5126836 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.9376Patch KB5126651
Event History
Frequently Asked Questions
Which systems are exposed to this issue?
Systems running the Windows DHCP Server role on the listed Microsoft Windows versions are exposed. Hosts that do not run Windows DHCP Server are not identified as affected by the provided data.
What does an attacker need to exploit it?
An attacker can exploit the issue remotely over a network without authentication, privileges, or user interaction. The stated impact is denial of service; no confidentiality or integrity impact is indicated.
Is there a workaround if patching cannot happen immediately?
No workaround or mitigation is provided in the available data. Prioritize reducing network exposure to the DHCP Server where operationally feasible until remediation guidance is available.
How can I determine whether I may be affected?
Identify whether the Windows DHCP Server role is enabled on any listed Windows 10 or Windows Server 2012 through 2025 systems. The provided information does not include affected build numbers or detection indicators.