CVE-2026-69497: Windows DHCP Server Denial of Service Vulnerability
Missing release of memory after effective lifetime in Windows DHCP Server allows an authorized 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 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 10.0.26100.33438Patch KB5122871 - 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
Event History
Frequently Asked Questions
Who can exploit this issue?
An attacker must be authorized and able to reach the Windows DHCP Server over the network. The provided data does not identify the specific authorization level or DHCP operation required.
What is the expected impact?
Successful exploitation can deny service by triggering memory that is not released after its effective lifetime. The supplied severity vector indicates availability impact only; it does not indicate confidentiality or integrity impact.
Which systems should be reviewed?
Review deployments of Microsoft Windows 10 and Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025 where the Windows DHCP Server role is in use. The data does not provide affected build numbers or fixed versions.