CVE-2025-24074 is a vulnerability identified in the Windows Desktop Window Manager (DWM) Core Library component of Microsoft Windows 10 Version 1809 (build 10.0.17763.0). The root cause is improper input validation (CWE-20), which allows an authorized local attacker to elevate their privileges on the affected system. Specifically, the flaw exists because the DWM Core Library does not correctly validate certain inputs, enabling attackers with limited privileges to manipulate the system state and gain higher-level access without requiring user interaction. The vulnerability has a CVSS v3.1 base score of 7.8, reflecting high severity due to its impact on confidentiality, integrity, and availability (all rated high), low attack complexity, and the requirement for only low privileges to exploit. The scope remains unchanged, meaning the exploit affects only the vulnerable component and does not extend beyond the local system. Although no known exploits are currently in the wild, the vulnerability's characteristics make it a significant risk for local privilege escalation attacks, potentially allowing attackers to execute arbitrary code with elevated rights or disrupt system operations. The vulnerability was reserved in January 2025 and published in April 2025, with no patch links provided yet, indicating that organizations should monitor for updates and apply them promptly once available. This vulnerability is particularly relevant for environments where Windows 10 Version 1809 remains in use, including legacy systems and certain enterprise deployments.

For European organizations, this vulnerability poses a substantial risk, especially in sectors relying on Windows 10 Version 1809, such as government, finance, healthcare, and critical infrastructure. Successful exploitation could allow attackers to escalate privileges locally, bypassing security controls and gaining unauthorized access to sensitive data or administrative functions. This could lead to data breaches, disruption of services, or deployment of further malware with elevated rights. The impact on confidentiality, integrity, and availability is high, potentially resulting in significant operational and reputational damage. Since the exploit requires local access but no user interaction, insider threats or attackers who gain initial foothold via other means could leverage this vulnerability to deepen their control over systems. European organizations with legacy systems or delayed patch cycles are particularly vulnerable, increasing the likelihood of exploitation in targeted attacks or lateral movement within networks.

1. Prioritize upgrading or patching Windows 10 Version 1809 systems as soon as Microsoft releases an official fix for CVE-2025-24074. 2. Restrict local access to systems running the affected version by enforcing strict access controls and limiting administrative privileges. 3. Implement application whitelisting and endpoint detection and response (EDR) solutions to monitor and block suspicious privilege escalation attempts. 4. Conduct regular audits of user privileges and remove unnecessary local accounts or rights that could be exploited. 5. Employ network segmentation to limit lateral movement opportunities if an attacker gains local access. 6. Educate IT staff and users about the risks of local privilege escalation vulnerabilities and the importance of timely patching. 7. Monitor security advisories from Microsoft and CISA for updates and exploit reports related to this vulnerability. 8. Consider upgrading to a more recent Windows version if feasible, as Windows 10 Version 1809 is an older release with reduced support lifecycle.