CVE-2025-24074 is a high-severity vulnerability identified in the Microsoft Windows 10 Version 1809 operating system, specifically within the Desktop Window Manager (DWM) Core Library. The root cause of this vulnerability is improper input validation (classified under CWE-20), which allows an authorized local attacker to elevate their privileges on the affected system. The vulnerability arises because the DWM Core Library fails to adequately validate input data, potentially enabling an attacker with limited privileges to execute code or perform actions with elevated system rights. This can compromise the confidentiality, integrity, and availability of the system by allowing unauthorized access to sensitive resources or system-level operations. The CVSS v3.1 base score is 7.8, reflecting a high severity level, with the attack vector being local (AV:L), requiring low attack complexity (AC:L), and low privileges (PR:L) but no user interaction (UI:N). The scope remains unchanged (S:U), and the impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H). Although no known exploits are currently reported in the wild, the vulnerability's characteristics suggest that exploitation could lead to significant system compromise. The affected version is Windows 10 build 17763.0, corresponding to Version 1809, which is an older but still in-use release in some environments. No official patches or mitigation links are provided yet, indicating that organizations should prioritize monitoring for updates and consider compensating controls. Given the local nature of the attack, an adversary would need some level of access to the system, but once exploited, the attacker could gain elevated privileges, potentially leading to full system compromise or lateral movement within a network.

For European organizations, this vulnerability poses a significant risk, especially in environments where Windows 10 Version 1809 is still deployed, such as legacy systems or specialized industrial setups. Successful exploitation could allow attackers to escalate privileges from a limited user account to administrative levels, enabling them to install malware, exfiltrate sensitive data, disrupt operations, or move laterally across networks. This is particularly concerning for sectors with strict data protection requirements under GDPR, such as finance, healthcare, and government, where unauthorized access or data breaches can lead to severe regulatory penalties and reputational damage. Additionally, organizations relying on Windows 10 Version 1809 in critical infrastructure or manufacturing may face operational disruptions if attackers leverage this vulnerability to compromise system integrity or availability. Although exploitation requires local access, insider threats or attackers who have gained initial footholds through phishing or other means could leverage this vulnerability to deepen their control. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, as proof-of-concept exploits could emerge rapidly once details are public.

Given the lack of an official patch at this time, European organizations should implement targeted mitigation strategies beyond generic advice. First, identify and inventory all systems running Windows 10 Version 1809, prioritizing those in sensitive or high-risk environments. Restrict local access to these systems by enforcing strict access controls and monitoring for unusual login activity. Employ application whitelisting and endpoint detection and response (EDR) solutions to detect and block suspicious behaviors indicative of privilege escalation attempts. Disable or limit the use of accounts with local privileges where possible, and enforce the principle of least privilege to reduce the attack surface. Network segmentation can help contain potential lateral movement if a system is compromised. Regularly review and harden system configurations, including disabling unnecessary services related to the Desktop Window Manager if feasible. Maintain up-to-date backups and develop incident response plans tailored to privilege escalation scenarios. Finally, monitor vendor communications closely for patches or updates addressing this vulnerability and plan prompt deployment once available.