CVE-2025-48816 is an integer overflow or wraparound vulnerability identified in the Human Interface Device (HID) class driver of Microsoft Windows 10 Version 1507 (build 10.0.10240.0). The flaw arises when the driver improperly handles integer values, leading to an overflow condition that can be exploited by an authorized local attacker to escalate privileges. Specifically, the vulnerability allows an attacker with low privileges and local access to execute code or perform actions with elevated system privileges without requiring user interaction. The CVSS v3.1 base score is 7.8, reflecting high severity due to its impact on confidentiality, integrity, and availability (all rated high). The attack vector is local (AV:L), with low attack complexity (AC:L), requiring privileges (PR:L) but no user interaction (UI:N). The scope remains unchanged (S:U). No known exploits have been reported in the wild, and no official patches have been linked as of the publication date. The vulnerability is categorized under CWE-190 (Integer Overflow or Wraparound), which often leads to memory corruption and potential arbitrary code execution. Since Windows 10 Version 1507 is an early release, many systems may have been upgraded, but legacy or isolated environments could still be vulnerable. The absence of patches necessitates immediate risk mitigation through access controls and system upgrades.

The vulnerability poses a significant risk to European organizations still operating Windows 10 Version 1507, particularly in sectors where legacy systems persist, such as industrial control, government, and critical infrastructure. Successful exploitation allows an attacker with local access to elevate privileges, potentially gaining full control over the affected system. This could lead to unauthorized data access, system manipulation, disruption of services, and deployment of further malware or ransomware. The high impact on confidentiality, integrity, and availability means sensitive information could be exposed or altered, and critical systems could be rendered inoperative. Given the local attack vector, insider threats or attackers who gain initial footholds through other means could leverage this vulnerability to deepen their access. The lack of known exploits reduces immediate risk but does not eliminate it, especially as exploit development may follow disclosure. European organizations with strict data protection regulations (e.g., GDPR) face compliance risks if breaches occur due to this vulnerability.

1. Immediately restrict local access to systems running Windows 10 Version 1507, especially limiting administrative and standard user accounts to trusted personnel only. 2. Monitor system logs and security events for unusual privilege escalation attempts or HID driver anomalies. 3. Prepare for and apply official patches from Microsoft as soon as they become available; subscribe to Microsoft security advisories for updates. 4. Where possible, upgrade affected systems to a supported and fully patched version of Windows 10 or later, as this version is out of mainstream support and unlikely to receive ongoing security updates. 5. Implement application whitelisting and endpoint detection and response (EDR) solutions to detect and block suspicious local activities. 6. Conduct regular vulnerability assessments and penetration testing focusing on local privilege escalation vectors. 7. Educate IT staff and users about the risks of local privilege escalation and the importance of maintaining updated systems. 8. For critical environments, consider network segmentation to limit lateral movement from compromised local accounts.