CVE-2026-77887: 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 level of access does an attacker need to exploit this issue?
The attacker must already be authorized and have high privileges on the affected system. Exploitation is local and does not require user interaction.
Are Windows client systems included in the affected software list?
Microsoft Windows 10 is listed, along with Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025, and Microsoft Windows DHCP Server. The provided data does not specify which editions, configurations, or DHCP Server roles are affected on those platforms.
What security impact could successful exploitation have?
Successful exploitation may allow code execution locally. The supplied vector also rates confidentiality, integrity, and availability impact as high.