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, the vulnerability arises because RRAS uses a resource that has not been properly initialized before use. This flaw can be exploited by an unauthorized attacker over a network to disclose sensitive information. The vulnerability does not require any privileges (PR:N) but does require user interaction (UI:R), such as convincing a user to connect to a malicious network or service. The attack vector is network-based (AV:N), meaning the attacker can exploit this remotely without physical access. The scope is unchanged (S:U), indicating that the vulnerability affects only the vulnerable component and does not propagate to other components. The impact is high on confidentiality (C:H), with no impact on integrity (I:N) or availability (A:N). The CVSS v3.1 base score is 6.5, categorized as medium severity. No known exploits are currently reported in the wild, and no patches or mitigation links are provided yet. The vulnerability could allow attackers to gain access to sensitive information transmitted or processed by RRAS, potentially including routing configurations, network topology details, or other data that could facilitate further attacks or reconnaissance. Since RRAS is often used in enterprise environments to provide VPN, dial-up, or routing services, exploitation could expose internal network information to external attackers, undermining network security and privacy.

For European organizations, the impact of CVE-2025-29830 could be significant, especially for enterprises relying on Windows 10 Version 1809 with RRAS enabled for remote access or routing services. Disclosure of sensitive network information could aid attackers in mapping internal networks, identifying critical infrastructure, or planning subsequent attacks such as lateral movement or targeted intrusions. This is particularly concerning for sectors with stringent data protection requirements, such as finance, healthcare, and government agencies, where information leakage could lead to regulatory penalties under GDPR or compromise of confidential data. Additionally, organizations with remote or hybrid work models that depend on RRAS for VPN connectivity may face increased risk of exposure. Although the vulnerability does not allow direct code execution or system compromise, the information disclosure could serve as a stepping stone for more severe attacks. The requirement for user interaction means phishing or social engineering could be used to trigger exploitation, increasing the risk in environments with less security awareness. The absence of known exploits in the wild currently reduces immediate risk, but the medium severity score and network attack vector warrant proactive measures.

Given the lack of an official patch at this time, European organizations should implement specific mitigations to reduce exposure. First, disable RRAS on Windows 10 Version 1809 systems where it is not strictly necessary, minimizing the attack surface. For systems requiring RRAS, restrict network access to RRAS services using firewall rules to limit connections to trusted IP addresses or VPN gateways. Employ network segmentation to isolate RRAS servers from general user networks and critical assets. Enhance user awareness training to reduce the likelihood of successful social engineering or phishing attempts that could trigger user interaction exploitation. Monitor network traffic for unusual RRAS connection attempts or data flows that could indicate exploitation attempts. Maintain up-to-date inventory of systems running Windows 10 Version 1809 and plan for upgrading to supported Windows versions with active security updates. Once a patch is released, prioritize its deployment on all affected systems. Additionally, consider deploying endpoint detection and response (EDR) solutions capable of identifying anomalous RRAS behavior or information disclosure attempts. Regularly review RRAS configuration to ensure minimal privileges and secure settings are enforced.