CVE-2025-59506 is a vulnerability classified under CWE-362, indicating a race condition due to improper synchronization of concurrent execution using shared resources within the Windows DirectX component on Windows 10 Version 1809 (build 10.0.17763.0). This flaw allows an authorized local attacker to exploit the race condition to elevate privileges on the affected system. The vulnerability arises because DirectX improperly manages concurrent access to shared resources, leading to a state where an attacker can manipulate execution timing to gain higher privileges than intended. The CVSS v3.1 score is 7.0 (high), reflecting local attack vector (AV:L), high attack complexity (AC:H), low privileges required (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 known exploits are currently reported in the wild, and no patches have been published yet. The vulnerability was reserved in September 2025 and published in November 2025. Given the affected product is Windows 10 Version 1809, which is an older but still widely used version in some enterprise environments, this vulnerability poses a significant risk to systems that have not been updated or migrated to newer Windows versions. The race condition nature of the vulnerability means exploitation requires precise timing and conditions, contributing to the high attack complexity rating. However, once exploited, it can lead to full system compromise by elevating privileges from a low-level user to higher administrative rights.

For European organizations, the impact of CVE-2025-59506 is substantial, particularly for those still operating Windows 10 Version 1809 in production environments. The ability for a local attacker to elevate privileges can lead to unauthorized access to sensitive data, disruption of critical services, and potential lateral movement within networks. This is especially concerning for sectors such as finance, healthcare, government, and critical infrastructure, where confidentiality and integrity of data are paramount. The high impact on availability also means that exploitation could result in system instability or denial of service. Since the vulnerability requires local access, insider threats or attackers who have gained initial footholds via other means could leverage this flaw to escalate privileges and deepen their control over affected systems. The lack of available patches increases the window of exposure, necessitating immediate compensating controls. European organizations with legacy systems or delayed patch management processes are at higher risk. Additionally, compliance with GDPR and other data protection regulations could be jeopardized if this vulnerability leads to data breaches.

Given the absence of an official patch at the time of this report, European organizations should implement the following specific mitigations: 1) Restrict local access to Windows 10 Version 1809 systems by enforcing strict user account controls and limiting administrative privileges to essential personnel only. 2) Employ application whitelisting and endpoint detection and response (EDR) solutions to monitor and block suspicious activities indicative of privilege escalation attempts. 3) Isolate legacy systems running Windows 10 Version 1809 from critical network segments to reduce the risk of lateral movement. 4) Conduct thorough audits of user accounts and remove or disable unnecessary local accounts to minimize attack surface. 5) Implement strict physical security controls to prevent unauthorized local access to devices. 6) Prepare for rapid deployment of patches once released by Microsoft by maintaining an updated inventory of affected systems and testing patch deployment procedures. 7) Educate IT staff and users about the risks of privilege escalation vulnerabilities and encourage prompt reporting of unusual system behavior. 8) Consider upgrading affected systems to supported Windows versions with active security updates to eliminate exposure to this and similar vulnerabilities.