CVE-2025-64679 is a heap-based buffer overflow vulnerability identified in the Windows Desktop Window Manager (DWM) Core Library component of Microsoft Windows 10 Version 1809 (build 10.0.17763.0). The vulnerability arises from improper handling of memory allocations on the heap, allowing an attacker with authorized local access and limited privileges to trigger a buffer overflow condition. This overflow can corrupt memory, enabling the attacker to execute arbitrary code or escalate privileges to SYSTEM level. The flaw does not require user interaction and has a low attack complexity, making exploitation feasible in environments where an attacker already has some local access. The vulnerability impacts confidentiality, integrity, and availability by potentially allowing full system compromise. Although no public exploits have been reported yet and no official patches have been released, the vulnerability has been assigned a high CVSS 3.1 score of 7.8, reflecting its severity. The lack of patches means organizations must rely on mitigations such as limiting local access, enforcing least privilege principles, and monitoring for anomalous behavior. The affected Windows 10 version 1809 is an older release, but still widely used in enterprise environments, especially where legacy applications or hardware compatibility is required. This vulnerability is classified under CWE-122 (Heap-based Buffer Overflow), a common and dangerous class of memory corruption bugs that often lead to privilege escalation and remote code execution in other contexts.

For European organizations, the impact of CVE-2025-64679 can be significant, particularly in sectors relying on Windows 10 Version 1809 systems such as manufacturing, healthcare, finance, and government. Successful exploitation allows attackers to escalate privileges locally, potentially gaining SYSTEM-level control. This can lead to unauthorized access to sensitive data, disruption of critical services, and the ability to disable security mechanisms. Organizations with legacy systems that have not been updated or migrated to newer Windows versions are especially vulnerable. The compromise of administrative privileges can facilitate lateral movement within networks, increasing the risk of widespread breaches. Given the vulnerability does not require user interaction, insider threats or attackers who gain initial footholds through other means can leverage this flaw to deepen their access. The absence of known exploits currently provides a window for proactive defense, but the high severity score indicates that once exploited, the consequences could be severe. European entities subject to strict data protection regulations such as GDPR must be particularly vigilant to prevent data breaches stemming from privilege escalation attacks.

Until an official patch is released, European organizations should implement targeted mitigations to reduce risk. First, restrict local access to systems running Windows 10 Version 1809 by enforcing strict physical and network access controls. Use application whitelisting and endpoint protection solutions to detect and block suspicious activities related to DWM or heap memory corruption attempts. Harden user privileges by applying the principle of least privilege, ensuring users do not have unnecessary local administrative rights. Employ enhanced logging and monitoring focused on local privilege escalation attempts and anomalous process behavior involving the DWM Core Library. Consider isolating legacy systems in segmented network zones to limit lateral movement. Where possible, accelerate migration to supported Windows versions with active security updates. Additionally, educate IT staff and users about the risks of local privilege escalation vulnerabilities and the importance of reporting unusual system behavior promptly. Finally, maintain up-to-date backups and incident response plans to quickly recover from potential compromises.