CVE-2025-62461 is a buffer over-read vulnerability classified under CWE-126 found in the Windows Projected File System Filter Driver component of Microsoft Windows 10 Version 1809 (build 10.0.17763.0). The vulnerability arises due to insufficient bounds checking when processing data within the filter driver, causing the system to read beyond the intended buffer limits. This flaw can be exploited by an attacker with authorized local access to the system, enabling them to elevate their privileges. The attack vector requires local access but no user interaction, making it a potent threat in environments where attackers have gained limited access. Exploiting this vulnerability can lead to disclosure of sensitive information, corruption of system memory, and ultimately full system compromise by escalating privileges from a lower-privileged user to SYSTEM or equivalent. The vulnerability has a CVSS v3.1 base score of 7.8, reflecting high impact on confidentiality, integrity, and availability, with low attack complexity and limited privileges required. No public exploits or patches are currently available, but the vulnerability is officially published and tracked. The affected Windows 10 version 1809 is an older release, but still in use in many enterprise and government environments, making this a relevant security concern.

The impact of CVE-2025-62461 is significant for organizations running Windows 10 Version 1809, particularly those in enterprise, government, and critical infrastructure sectors that may still rely on this legacy OS version. Successful exploitation allows an attacker with local access to escalate privileges, potentially gaining SYSTEM-level control. This can lead to unauthorized access to sensitive data, installation of persistent malware, disruption of system operations, and lateral movement within networks. The vulnerability compromises confidentiality, integrity, and availability simultaneously, increasing the risk of severe breaches and operational disruptions. Since the attack requires local access but no user interaction, insider threats or attackers who have gained initial footholds can leverage this flaw to deepen their control. The absence of known exploits in the wild reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits once patches are released. Organizations with unpatched systems face elevated risk of targeted attacks, data breaches, and compliance violations.

To mitigate CVE-2025-62461, organizations should: 1) Prioritize upgrading or patching Windows 10 Version 1809 systems once Microsoft releases an official security update addressing this vulnerability. 2) Restrict local access to critical systems by enforcing strict access controls, limiting administrative privileges, and using least privilege principles. 3) Employ endpoint detection and response (EDR) solutions to monitor for suspicious activities indicative of privilege escalation attempts. 4) Harden systems by disabling or restricting use of the Projected File System Filter Driver if feasible, or applying configuration changes recommended by Microsoft post-disclosure. 5) Conduct regular audits of user accounts and permissions to detect and remove unnecessary privileges. 6) Use application whitelisting and behavioral analytics to prevent unauthorized code execution. 7) Educate IT staff and users about the risks of local privilege escalation vulnerabilities and the importance of timely patching. 8) Maintain network segmentation to limit lateral movement opportunities if an attacker exploits this vulnerability. These targeted measures go beyond generic advice by focusing on controlling local access, monitoring for exploitation signs, and preparing for patch deployment.