CVE-2026-77891: Windows DHCP Server Remote Code Execution Vulnerability
Out-of-bounds read in Windows DHCP Server allows an authorized attacker to execute code locally.
Other sources
Windows DHCP Server Remote Code Execution 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 6.2.9200.26349Patch KB5123065 - 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 - 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 10.0.17763.9245Patch KB5122876
Event History
Frequently Asked Questions
What access does an attacker need to exploit this issue?
Exploitation requires local access and high privileges. The attack complexity is high, and no user interaction is required.
Which environments should be reviewed first?
Review Microsoft Windows 10 and Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025 systems that use Windows DHCP Server.