CVE-2026-77893: 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 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 - 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 10.0.20348.5622Patch KB5122882 - 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 6.3.9600.23397Patch KB5123066
Event History
Frequently Asked Questions
Which systems are exposed to this issue?
Systems running Windows DHCP Server on the listed Microsoft Windows 10 and Windows Server versions are potentially exposed. The affected list includes Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025.
Does exploitation require credentials or user interaction?
No. The vulnerability is network-reachable and can be exploited by an unauthorized attacker without privileges or user interaction.
What is the expected impact of a successful attack?
Successful exploitation can deny service from the Windows DHCP Server. The provided scoring indicates availability impact only, with no stated confidentiality or integrity impact.