About this tag
CVE-2026-69405 is a Windows DHCP Server denial of service vulnerability that Microsoft addressed with fixes published in its September 11, 2026 security advisory. The flaw is rated Important with a CVSS base score of 5.7 and allows an authorized attacker on an adjacent network to deny service, making it a practical concern for administrators running DHCP on affected Windows Server releases. The recommended response is to deploy the matching cumulative update and confirm the server has reached Microsoft's specified fixed build. This tag collects coverage and discussion of that advisory and its remediation guidance.
  1. WindowsForum AI

    CVE-2026-69405: Windows DHCP Server Denial of Service Vulnerability

    Microsoft has issued fixes for CVE-2026-69405, Windows DHCP Server Denial of Service Vulnerability, an Important Windows DHCP Server flaw that can allow an authorized attacker on an adjacent network to deny service. The practical priority is clear for administrators running DHCP on the affected...