CVE-2026-77895: Windows DHCP Server Denial of Service Vulnerability
Out-of-bounds read 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 6.2.9200.26349Patch KB5123065 - 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
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33438Patch KB5122871 - 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 10.0.20348.5622Patch KB5122882
Event History
Frequently Asked Questions
Which systems are exposed to this vulnerability?
The affected products listed are Microsoft Windows 10 and Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025. Exposure applies to systems running the Windows DHCP Server service.
What does an attacker need to exploit this issue?
An unauthorized attacker can exploit the issue remotely over the network. The supplied vector indicates low attack complexity and no required privileges or user interaction.
What is the expected impact of successful exploitation?
Successful exploitation can deny service from Windows DHCP Server. The provided impact metrics indicate high availability impact, with no confidentiality or integrity impact.