CVE-2025-24059 is a vulnerability identified in the Windows Common Log File System Driver component of Microsoft Windows 10 Version 1809 (build 10.0.17763.0). The root cause is an incorrect conversion between numeric types, classified under CWE-681 (Incorrect Conversion between Numeric Types). This flaw can be leveraged by an authorized local attacker to escalate privileges on the affected system. The vulnerability does not require user interaction, and the attack complexity is low, meaning an attacker with legitimate access to the system can exploit this to gain elevated privileges, potentially leading to full system compromise. The vulnerability affects confidentiality, integrity, and availability, as elevated privileges can allow attackers to access sensitive data, modify system configurations, or disrupt system operations. The CVSS v3.1 base score is 7.8, reflecting a high severity level. Currently, there are no known exploits in the wild, and no official patches have been released, increasing the urgency for mitigation. The vulnerability is particularly critical for environments where Windows 10 Version 1809 is still in use, especially in legacy systems that have not been updated to newer Windows versions. The flaw's exploitation could be a stepping stone for attackers to move laterally or gain persistent control within a network.

For European organizations, this vulnerability poses a significant risk, especially those relying on Windows 10 Version 1809 in critical infrastructure, government, healthcare, and financial sectors. Successful exploitation could lead to unauthorized privilege escalation, enabling attackers to bypass security controls, access sensitive information, disrupt services, or deploy further malware. The impact extends to data confidentiality breaches, integrity violations through unauthorized modifications, and availability issues if attackers disable or corrupt system components. Given the local access requirement, insider threats or attackers who have gained initial footholds via other means could leverage this vulnerability to deepen their control. Organizations with legacy systems or delayed patching cycles are particularly vulnerable. The absence of a patch increases the window of exposure, necessitating immediate compensating controls to reduce risk.

1. Restrict local access to systems running Windows 10 Version 1809 by enforcing strict access control policies and limiting administrative privileges. 2. Implement robust endpoint detection and response (EDR) solutions to monitor for unusual privilege escalation activities. 3. Enforce application whitelisting and least privilege principles to minimize the potential attack surface. 4. Prioritize upgrading or migrating systems from Windows 10 Version 1809 to supported, patched Windows versions to eliminate exposure. 5. Use network segmentation to isolate legacy systems and reduce lateral movement opportunities. 6. Conduct regular audits of user accounts and permissions to detect and remediate excessive privileges. 7. Monitor system logs for anomalies related to the Common Log File System Driver and privilege escalation attempts. 8. Prepare incident response plans specifically addressing local privilege escalation scenarios. 9. Stay informed on official patches or updates from Microsoft and apply them promptly once available.