CVE-2025-62213 is a use-after-free vulnerability classified under CWE-416 affecting the Windows Ancillary Function Driver for WinSock in Microsoft Windows 10 Version 1607 (build 10.0.14393.0). Use-after-free vulnerabilities occur when a program continues to use memory after it has been freed, leading to undefined behavior such as memory corruption, crashes, or code execution. In this case, the vulnerability allows an authorized local attacker with low privileges to exploit the improper handling of memory in the WinSock driver, which is responsible for network socket operations. By triggering this flaw, the attacker can elevate their privileges on the system, potentially gaining SYSTEM-level access. The CVSS v3.1 score of 7.0 reflects high severity, with attack vector local (AV:L), attack complexity high (AC:H), privileges required low (PR:L), no user interaction (UI:N), and impacts on confidentiality, integrity, and availability all rated high (C:H/I:H/A:H). The vulnerability was reserved in early October 2025 and published in November 2025, with no known public exploits or patches available at the time of reporting. This vulnerability primarily affects legacy Windows 10 systems still running version 1607, which is an older release no longer supported by mainstream updates, increasing the risk for organizations that have not upgraded. Exploitation could allow attackers to bypass security controls and execute arbitrary code with elevated privileges, compromising system security and potentially enabling further lateral movement or persistence.

The impact of CVE-2025-62213 is significant for organizations still operating Windows 10 Version 1607, especially those with sensitive or critical systems. Successful exploitation leads to privilege escalation from a low-privileged local user to SYSTEM-level privileges, effectively granting full control over the affected machine. This can result in unauthorized access to confidential data, modification or deletion of critical files, installation of persistent malware, and disruption of system availability. Since the vulnerability affects the WinSock driver, which is integral to network communications, attackers could leverage this to facilitate further network-based attacks or pivot within enterprise environments. The high attack complexity and requirement for local access somewhat limit remote exploitation, but insider threats or compromised user accounts could still pose a serious risk. Organizations relying on legacy Windows 10 versions in industrial control systems, government agencies, healthcare, and financial sectors are particularly vulnerable due to the critical nature of their operations and the potential impact of a successful attack.

To mitigate CVE-2025-62213, organizations should prioritize upgrading from Windows 10 Version 1607 to a supported and fully patched version of Windows 10 or later. If immediate upgrade is not feasible, implement strict access controls to limit local user accounts and reduce the attack surface. Employ application whitelisting and endpoint detection and response (EDR) solutions to monitor and block suspicious activities related to WinSock or privilege escalation attempts. Disable or restrict unnecessary network services that rely on the vulnerable WinSock driver where possible. Regularly audit and review user privileges to ensure least privilege principles are enforced. Since no official patches were available at the time of disclosure, organizations should monitor Microsoft security advisories for updates and apply them promptly once released. Additionally, implement network segmentation to contain potential compromises and maintain robust incident response plans to quickly address any exploitation attempts.