CVE-2025-62457 is an out-of-bounds read vulnerability classified under CWE-125, discovered in the Windows Cloud Files Mini Filter Driver component of Microsoft Windows 11 Version 25H2 (build 10.0.26200.0). The vulnerability arises due to improper bounds checking within the mini filter driver, which handles cloud file synchronization and caching. An authorized local attacker can exploit this flaw by triggering the out-of-bounds read condition, potentially accessing or corrupting memory outside the intended buffer boundaries. This memory corruption can lead to privilege escalation, allowing the attacker to elevate their privileges from a lower-level user to SYSTEM-level, thereby gaining full control over the affected system. The vulnerability does not require user interaction but does require local access with some privileges (PR:L). The attack complexity is low (AC:L), meaning exploitation is feasible without specialized conditions. The vulnerability impacts confidentiality, integrity, and availability (all rated high), as the attacker can access sensitive data, modify system state, or disrupt system operations. No public exploits or active exploitation in the wild have been reported as of the publication date. Microsoft has not yet released patches, but organizations are advised to monitor for updates and prepare for rapid deployment. The vulnerability's presence in Windows 11 25H2 means it affects modern enterprise and consumer environments relying on this OS version, particularly those utilizing cloud file synchronization features.

For European organizations, the impact of CVE-2025-62457 could be significant. Successful exploitation enables local attackers to escalate privileges to SYSTEM level, potentially leading to full system compromise. This could result in unauthorized access to sensitive corporate data, disruption of critical services, and the ability to deploy further malware or ransomware. Organizations with strict data protection requirements under GDPR could face compliance violations if breaches occur. The vulnerability affects Windows 11 Version 25H2, which is increasingly adopted in enterprise environments across Europe, including government, finance, healthcare, and manufacturing sectors. The ability to escalate privileges locally also raises concerns for insider threats or attackers who have gained limited access through other means. The lack of required user interaction facilitates stealthy exploitation. Consequently, the vulnerability poses a high risk to confidentiality, integrity, and availability of systems and data within European organizations.

1. Monitor Microsoft security advisories closely and apply official patches for Windows 11 Version 25H2 as soon as they are released. 2. Until patches are available, restrict local access to systems running the affected OS version by enforcing strict user account controls and limiting administrative privileges. 3. Implement application whitelisting and endpoint detection and response (EDR) solutions to detect anomalous behavior indicative of privilege escalation attempts. 4. Regularly audit and monitor logs for unusual access patterns or privilege escalations on endpoints. 5. Disable or restrict the use of the Windows Cloud Files Mini Filter Driver if feasible in the organizational environment, especially if cloud file synchronization is not required. 6. Educate IT staff about the vulnerability and ensure rapid incident response capabilities are in place. 7. Employ network segmentation to limit lateral movement in case of compromise. 8. Consider deploying enhanced memory protection features available in Windows 11, such as Control Flow Guard and Memory Integrity, to mitigate exploitation attempts.