CVE-2025-29830 is a vulnerability identified in Microsoft Windows 10 Version 1809, specifically affecting the Windows Routing and Remote Access Service (RRAS). The issue is classified under CWE-908, which refers to the use of uninitialized resources. In this context, an uninitialized resource means that certain memory or data structures within RRAS are used before being properly initialized, potentially exposing sensitive information. This flaw allows an unauthorized attacker to remotely disclose information over the network without requiring prior authentication, though user interaction is necessary to trigger the vulnerability. The vulnerability has a CVSS v3.1 base score of 6.5, indicating a medium severity level. The attack vector is network-based (AV:N), with low attack complexity (AC:L), no privileges required (PR:N), but requires user interaction (UI:R). The scope is unchanged (S:U), and the impact is high on confidentiality (C:H), with no impact on integrity or availability. No known exploits are currently reported in the wild, and no official patches have been linked yet. The vulnerability could allow attackers to extract sensitive information from affected systems remotely, potentially leading to further targeted attacks or reconnaissance activities.

For European organizations, this vulnerability poses a moderate risk, especially for those still running Windows 10 Version 1809 in their infrastructure. Since RRAS is often used to provide VPN and routing capabilities, exploitation could lead to unauthorized disclosure of sensitive network configuration or user data. This could facilitate lateral movement or targeted espionage, particularly in sectors handling sensitive or regulated data such as finance, healthcare, and government. The fact that no authentication is required lowers the barrier for attackers, increasing the risk of opportunistic attacks. However, the requirement for user interaction somewhat limits mass exploitation. Organizations relying on legacy systems or with delayed patch management processes are at higher risk. The vulnerability does not affect system integrity or availability directly but compromises confidentiality, which can have serious regulatory and reputational consequences under GDPR and other European data protection laws.

European organizations should prioritize identifying and inventorying all systems running Windows 10 Version 1809, especially those utilizing RRAS. Since no official patch is currently linked, organizations should implement network-level mitigations such as restricting RRAS access to trusted networks and VPN endpoints only, employing strict firewall rules to limit exposure, and monitoring RRAS-related network traffic for unusual activity. User education is important to reduce the risk of triggering the vulnerability via social engineering or phishing that could prompt user interaction. Additionally, organizations should consider upgrading affected systems to newer, supported Windows versions where this vulnerability is not present. Implementing network segmentation to isolate RRAS servers and employing intrusion detection/prevention systems with signatures for anomalous RRAS behavior can further reduce risk. Regular vulnerability scanning and threat hunting focused on RRAS components will help detect exploitation attempts early.