CVE-2025-49664 is a vulnerability classified under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) affecting Microsoft Windows 10 Version 1507 (build 10240). The flaw exists in the Windows User-Mode Driver Framework Host component, which is responsible for managing user-mode drivers. An attacker with authorized local access and low privileges can exploit this vulnerability to disclose sensitive information stored or processed by the driver framework. The vulnerability does not require user interaction and has a low attack complexity, but it is limited to local exploitation, meaning remote attackers cannot leverage this flaw directly. The CVSS v3.1 base score is 5.5, indicating a medium severity level, primarily due to the high impact on confidentiality, while integrity and availability remain unaffected. No known exploits have been reported in the wild, and no official patches or mitigations have been linked yet, although the vulnerability was published in July 2025. The affected Windows 10 version is the initial release from 2015, which is largely superseded by newer versions but may still be in use in legacy environments. This vulnerability could allow attackers to gain access to sensitive data that could be leveraged for further attacks or information gathering within compromised systems.

For European organizations, the primary impact of CVE-2025-49664 is the potential unauthorized disclosure of sensitive information on systems running Windows 10 Version 1507. This could include exposure of credentials, configuration data, or other sensitive operational information that resides within the User-Mode Driver Framework Host context. While the vulnerability does not affect system integrity or availability, the confidentiality breach could facilitate lateral movement, privilege escalation, or targeted espionage activities. Organizations in sectors such as government, finance, healthcare, and critical infrastructure that still operate legacy Windows 10 systems are at higher risk. The local access requirement limits the threat to insiders or attackers who have already compromised user accounts with low privileges. However, the lack of user interaction and low complexity of exploitation increase the likelihood of successful attacks once local access is obtained. The absence of known exploits in the wild reduces immediate risk but does not eliminate the potential for future exploitation, especially in environments with delayed patching or legacy system usage.

1. Upgrade affected systems from Windows 10 Version 1507 to a supported and fully patched Windows version, such as Windows 10 LTSC or Windows 11, to eliminate exposure to this vulnerability. 2. Implement strict access controls and monitoring to limit local user privileges and detect unauthorized access attempts, reducing the risk of local exploitation. 3. Employ endpoint detection and response (EDR) solutions capable of identifying suspicious activities related to the User-Mode Driver Framework Host. 4. Conduct regular audits of legacy systems to identify and prioritize remediation of outdated operating systems. 5. If upgrading is not immediately feasible, apply any available Microsoft security advisories or workarounds that may mitigate information disclosure risks. 6. Educate IT staff and users about the risks of running unsupported Windows versions and the importance of timely patching and system upgrades. 7. Isolate legacy systems from critical network segments to reduce the impact of potential local exploits.