CVE-2025-62464 is a buffer over-read vulnerability classified under CWE-126 affecting the Windows Projected File System (ProjFS) in Microsoft Windows 10 Version 1809 (build 10.0.17763.0). The flaw arises from improper handling of memory buffers within the ProjFS component, which is responsible for projecting file system data from a provider to a consumer, enabling virtualization of file system data. An authorized local attacker with limited privileges can exploit this vulnerability to read beyond the intended memory boundaries, potentially accessing sensitive information or corrupting memory structures. This can lead to elevation of privileges, allowing the attacker to execute code with higher privileges or compromise system integrity. The vulnerability has a CVSS v3.1 base score of 7.8, indicating high severity, with attack vector local (AV:L), low attack complexity (AC:L), requiring privileges (PR:L), no user interaction (UI:N), unchanged scope (S:U), and high impact on confidentiality, integrity, and availability (C:H/I:H/A:H). No public exploits or patches are currently available, but the vulnerability is publicly disclosed and should be addressed promptly. The vulnerability's exploitation does not require user interaction but does require local access with some privileges, making insider threats or compromised local accounts the primary risk vectors.

The impact of CVE-2025-62464 is significant for organizations running Windows 10 Version 1809, particularly those that have not upgraded to newer Windows versions or applied mitigations. Successful exploitation allows an attacker with limited local privileges to escalate their privileges to SYSTEM or equivalent, potentially gaining full control over the affected system. This can lead to unauthorized access to sensitive data, installation of persistent malware, disruption of critical services, and lateral movement within networks. The high impact on confidentiality, integrity, and availability means that critical infrastructure, enterprise environments, and government systems are at risk. The lack of known exploits in the wild currently reduces immediate risk, but the public disclosure increases the likelihood of future exploit development. Organizations relying on legacy Windows 10 versions, especially in sectors like finance, healthcare, manufacturing, and government, face elevated risk due to the critical nature of the vulnerability and the potential for insider threat exploitation.

1. Apply official patches or updates from Microsoft as soon as they become available for Windows 10 Version 1809. Monitor Microsoft security advisories closely. 2. If patching is not immediately possible, restrict local access to systems running the affected version by enforcing strict access controls and limiting user privileges. 3. Implement application whitelisting and endpoint detection and response (EDR) solutions to detect anomalous privilege escalation attempts. 4. Conduct regular audits of user accounts and permissions to minimize the number of users with local privileges. 5. Use virtualization or sandboxing techniques to isolate critical workloads and reduce the attack surface. 6. Monitor system logs and security events for signs of exploitation attempts targeting ProjFS or unusual memory access patterns. 7. Consider upgrading affected systems to supported Windows versions with active security updates to reduce exposure to legacy vulnerabilities. 8. Educate IT staff and users about the risks of local privilege escalation vulnerabilities and the importance of timely patching and access control.