CVE-2025-29829 is a medium-severity vulnerability identified in Microsoft Windows 10 Version 1809 (build 10.0.17763.0). The flaw is classified under CWE-908, which refers to the use of uninitialized resources. Specifically, this vulnerability exists in the Windows Trusted Runtime Interface Driver, a component responsible for secure runtime operations within the Windows kernel environment. The issue arises because the driver uses a resource that has not been properly initialized before use. This can lead to the disclosure of sensitive information to an authorized local attacker. The attacker must have some level of privileges (low privileges, as indicated by PR:L) on the affected system to exploit this vulnerability. No user interaction is required to trigger the vulnerability, and the attack vector is local, meaning the attacker needs local access to the machine. The vulnerability impacts confidentiality (C:H), but does not affect integrity or availability. There are no known exploits in the wild at the time of publication, and no official patches have been linked yet. The CVSS v3.1 base score is 5.5, reflecting a medium severity level due to the limited attack vector and requirement for local privileges, but with a high impact on confidentiality. This vulnerability could allow attackers to read sensitive information from memory or other protected resources, potentially leading to further attacks or information leakage within the compromised system.

For European organizations, the impact of CVE-2025-29829 primarily concerns the confidentiality of sensitive data on systems running Windows 10 Version 1809. Many enterprises, especially those with legacy systems or slower upgrade cycles, may still operate this version, exposing them to potential information disclosure risks. The local nature of the attack means that threat actors would need to gain initial access or have insider privileges to exploit this vulnerability, which could be feasible in environments with insufficient endpoint security or insider threat risks. Confidential data leakage could include credentials, cryptographic keys, or other sensitive runtime information, potentially facilitating lateral movement or privilege escalation in targeted attacks. This vulnerability could be particularly concerning for sectors handling sensitive personal data (e.g., healthcare, finance, government) under strict European data protection regulations like GDPR, where data breaches can lead to significant legal and financial consequences. Although no known exploits exist yet, the presence of this vulnerability in a widely used OS version necessitates proactive mitigation to prevent potential exploitation, especially in high-security environments.

1. Prioritize upgrading affected systems from Windows 10 Version 1809 to a more recent, supported Windows version where this vulnerability is resolved. 2. Until upgrades are feasible, implement strict local access controls and endpoint security measures to limit the ability of unauthorized or low-privileged users to execute code or access sensitive system components. 3. Employ application whitelisting and privilege management to reduce the risk of local attackers gaining the necessary privileges to exploit the vulnerability. 4. Monitor systems for unusual local activity or attempts to access the Trusted Runtime Interface Driver or related kernel components. 5. Use endpoint detection and response (EDR) tools to detect suspicious behavior indicative of attempts to exploit uninitialized resource vulnerabilities. 6. Maintain up-to-date backups and incident response plans to quickly respond to any potential information disclosure incidents. 7. Stay informed on Microsoft’s security advisories for the release of patches or mitigations specific to CVE-2025-29829 and apply them promptly once available.