CVE-2025-29829 is a medium-severity vulnerability identified in Microsoft Windows 10 Version 1809 (build 10.0.17763.0) involving the Windows Trusted Runtime Interface Driver. The vulnerability is classified under CWE-908, which pertains to the use of uninitialized resources. Specifically, this flaw allows an authorized local attacker with limited privileges (low privileges) to exploit the use of an uninitialized resource within the Trusted Runtime Interface Driver, potentially leading to the disclosure of sensitive information. The vulnerability does not require user interaction and does not affect system integrity or availability, but it impacts confidentiality by exposing potentially sensitive data. The CVSS v3.1 base score is 5.5, reflecting a medium severity level. The attack vector is local (AV:L), with low attack complexity (AC:L), requiring privileges (PR:L), no user interaction (UI:N), and unchanged scope (S:U). The vulnerability is currently not known to be exploited in the wild, and no patches or mitigations have been officially published as of the date of analysis. The Trusted Runtime Interface Driver is a critical component that handles secure runtime operations, so improper initialization of resources can lead to leakage of sensitive runtime data. This vulnerability is limited to Windows 10 Version 1809, which is an older version of Windows 10, and may still be in use in some enterprise environments. Given the nature of the vulnerability, an attacker with local access and limited privileges could leverage this flaw to gain unauthorized access to sensitive information, which could be used for further attacks or reconnaissance within the compromised system.

For European organizations, the impact of CVE-2025-29829 primarily concerns confidentiality breaches on systems running Windows 10 Version 1809. Although the vulnerability requires local access and privileges, it could be exploited by malicious insiders or through lateral movement after initial compromise. Disclosure of sensitive information could include credentials, cryptographic keys, or other runtime secrets managed by the Trusted Runtime Interface Driver, potentially facilitating privilege escalation or further exploitation. Organizations in sectors with strict data protection regulations, such as finance, healthcare, and government, could face compliance risks if sensitive data is exposed. Additionally, legacy systems or environments where Windows 10 Version 1809 remains in use are at higher risk, especially if these systems handle critical or sensitive workloads. The lack of a patch increases the urgency for mitigation, and the medium severity score indicates a moderate but non-negligible risk. The vulnerability does not affect system availability or integrity directly, so operational disruption is unlikely, but confidentiality loss could have reputational and regulatory consequences.

Given the absence of an official patch, European organizations should implement the following specific mitigations: 1) Identify and inventory all systems running Windows 10 Version 1809 to assess exposure. 2) Where feasible, upgrade affected systems to a supported and patched version of Windows 10 or later, as newer versions are unlikely to contain this vulnerability. 3) Restrict local access to affected systems by enforcing strict access controls, including the use of least privilege principles and limiting administrative or privileged user accounts. 4) Monitor and audit local user activities on affected systems to detect unusual or unauthorized access attempts. 5) Employ endpoint detection and response (EDR) tools to identify suspicious behavior related to the Trusted Runtime Interface Driver or attempts to access sensitive runtime resources. 6) Educate users and administrators about the risks of local privilege misuse and enforce strong physical and network security controls to prevent unauthorized local access. 7) Stay informed on updates from Microsoft regarding patches or workarounds and apply them promptly once available. These targeted mitigations go beyond generic advice by focusing on access control, system inventory, and monitoring specific to the affected Windows version and component.