CVE-2025-64680 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 flaw arises from improper handling of heap memory allocations, which can be exploited by an authorized local attacker to overwrite memory buffers beyond their intended boundaries. This memory corruption can lead to arbitrary code execution with elevated privileges, effectively allowing the attacker to escalate from a limited user account to SYSTEM or equivalent high-privilege levels. The vulnerability does not require user interaction but does require the attacker to have some level of local access (local privilege). The CVSS v3.1 score of 7.8 reflects high severity, with impacts rated as high on confidentiality, integrity, and availability. No public exploits or patches are currently available, increasing the risk window for organizations still running this legacy OS version. The vulnerability is classified under CWE-122 (Heap-based Buffer Overflow), a common and dangerous class of memory corruption bugs that can lead to critical security breaches. Given that Windows 10 Version 1809 is an older release, many organizations may have legacy systems still in operation, especially in environments where upgrading is complex or delayed.

For European organizations, the impact of CVE-2025-64680 is significant due to the potential for local privilege escalation leading to full system compromise. Attackers exploiting this vulnerability can gain elevated privileges, bypassing security controls and potentially accessing sensitive data, modifying system configurations, or deploying malware with high-level permissions. This can disrupt business operations, lead to data breaches, and compromise critical infrastructure. Sectors such as government, finance, healthcare, and industrial control systems are particularly at risk due to their reliance on legacy Windows 10 systems and the critical nature of their data and services. The absence of known exploits currently reduces immediate risk but also means organizations must proactively mitigate before attackers develop reliable exploit code. The vulnerability's presence in a core Windows component used widely across enterprise desktops and servers increases the scope of affected systems, amplifying potential impact across European enterprises.

1. Immediately identify and inventory all systems running Windows 10 Version 1809 (build 10.0.17763.0) within the organization. 2. Restrict local user access on vulnerable systems to only trusted personnel and accounts with a strict need for access. 3. Implement application whitelisting and endpoint protection solutions capable of detecting anomalous behavior related to privilege escalation attempts. 4. Monitor system logs and security events for unusual activity indicative of exploitation attempts targeting the DWM Core Library. 5. Prepare for rapid deployment of official patches or updates from Microsoft once released; consider engaging with Microsoft support for early access or mitigation guidance. 6. Where possible, plan and accelerate migration off Windows 10 Version 1809 to supported and patched Windows versions to eliminate exposure. 7. Employ network segmentation to isolate legacy systems and reduce the risk of lateral movement if compromise occurs. 8. Educate local administrators and users about the risks of privilege escalation vulnerabilities and enforce the principle of least privilege rigorously.