CVE-2026-70201: Windows DHCP Server Denial of Service Vulnerability
Out-of-bounds read in Windows DHCP Server allows an authorized attacker to deny service locally.
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 10.0.26100.33650Patch KB5126646 - 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 6.2.9200.26434Patch KB5126835 - 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 10.0.20348.5761Patch KB5126655 - 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 in scope?
The affected software list includes Microsoft Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025. Exposure is relevant to systems running the Windows DHCP Server role.
What access does an attacker need to exploit this issue?
The attacker must already be authorized and have local access. The provided vector does not indicate that remote or unauthenticated exploitation is possible.
What is the expected impact?
Successful exploitation can deny service on the Windows DHCP Server. The supplied CVSS vector indicates no confidentiality or integrity impact, with high availability impact.