CVE-2026-70065: Windows DHCP Server Denial of Service Vulnerability
Missing release of memory after effective lifetime 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 6.3.9600.23397Patch KB5123066 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.9245Patch KB5122876 - Upgrade
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Fixed in 6.2.9200.26349Patch KB5123065 - Upgrade
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Fixed in 10.0.20348.5622Patch KB5122882 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.14393.9512Patch KB5123099 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33438Patch KB5122871
Event History
Frequently Asked Questions
Who can exploit this issue?
An unauthorized attacker can exploit it remotely over a network. No privileges or user interaction are required.
What is the expected impact of successful exploitation?
Successful exploitation can deny service on Windows DHCP Server. The supplied severity vector indicates availability impact only, with no stated confidentiality or integrity impact.
Which systems are identified as affected?
The affected software list includes Microsoft Windows 10 and Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025. Exposure depends on whether the Windows DHCP Server role is in use; the provided data does not identify affected update levels or configurations.