CVE-2025-24066 is a heap-based buffer overflow vulnerability classified under CWE-122, found in kernel-mode drivers of Microsoft Windows 10 Version 1809 (build 17763.0). This vulnerability arises from improper handling of memory buffers in the Windows kernel, which can be exploited by an attacker with local authorized access to execute arbitrary code with elevated privileges. Specifically, the attacker can trigger a buffer overflow on the heap, corrupting memory structures and potentially gaining SYSTEM-level privileges. The vulnerability does not require user interaction but does require local privileges, meaning the attacker must already have some level of access to the system. The CVSS v3.1 score of 7.8 indicates a high severity, with high impact on confidentiality, integrity, and availability, and low attack complexity. Although no public exploits are currently known, the vulnerability's presence in a widely deployed OS version makes it a critical concern. The lack of available patches at the time of publication necessitates immediate risk mitigation strategies. This vulnerability could be leveraged in targeted attacks or lateral movement scenarios within compromised networks, especially in environments where Windows 10 1809 remains in use.

For European organizations, the impact of CVE-2025-24066 is significant due to the potential for local privilege escalation leading to full system compromise. Attackers gaining SYSTEM privileges can bypass security controls, access sensitive data, install persistent malware, or disrupt critical services. Organizations running legacy Windows 10 1809 systems, particularly in sectors such as government, finance, healthcare, and critical infrastructure, face increased risk. The vulnerability could facilitate insider threats or be used in multi-stage attacks where initial access is limited. The compromise of endpoint devices could lead to broader network infiltration, data breaches, and operational disruptions. Given the high confidentiality, integrity, and availability impact, failure to address this vulnerability could result in regulatory penalties under GDPR if personal data is exposed. The absence of known exploits currently provides a window for proactive defense, but the risk of future exploitation remains high.

1. Prioritize patching: Monitor Microsoft security advisories closely and apply official patches immediately once released for Windows 10 Version 1809 systems. 2. Restrict local access: Limit administrative and local user privileges to trusted personnel only, reducing the attack surface for local privilege escalation. 3. Employ application whitelisting and endpoint protection to detect anomalous behavior indicative of exploitation attempts. 4. Use virtualization-based security features and kernel protection mechanisms available in newer Windows versions to mitigate exploitation impact. 5. Consider upgrading affected systems to a supported, more secure Windows version to eliminate exposure to legacy vulnerabilities. 6. Implement strict network segmentation to contain potential compromises originating from exploited endpoints. 7. Conduct regular security audits and vulnerability assessments focusing on legacy systems. 8. Educate users about the risks of local privilege escalation and enforce strong access controls. 9. Monitor system logs and security telemetry for unusual kernel-mode activity or crashes that may indicate exploitation attempts.