CVE-2026-77505: CWE-416: Use After Free in Microsoft Windows 10 Version 1607

CVE-2026-77505 is a use-after-free vulnerability (CWE-416) in the DNS Server of Microsoft Windows 10 Version 1607 and other specified versions. An attacker can exploit this flaw remotely to execute arbitrary code without requiring privileges or user interaction. The vulnerability has a CVSS 3.1 base score of 8.1, indicating high severity, with network attack vector, high impact on confidentiality, integrity, and availability, and requires high attack complexity. Official fixes have been released by Microsoft to remediate this issue.

Successful exploitation of this vulnerability could allow an unauthenticated attacker to execute arbitrary code remotely on affected systems, potentially leading to full system compromise including confidentiality, integrity, and availability impacts. No known exploits in the wild have been reported at this time.

Microsoft has released official security updates that address this vulnerability. It is strongly recommended to apply the provided patches promptly to affected systems. Since this is not a cloud service, remediation depends on applying these updates. Check the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77505 for the latest patch information and deployment guidance.