CVE-2025-29959 is a vulnerability classified under CWE-908 (Use of Uninitialized Resource) affecting Microsoft Windows 10 Version 1507 (build 10.0.10240.0). The flaw exists within the Routing and Remote Access Service (RRAS), a component that provides routing and remote access capabilities to Windows systems. The vulnerability arises because RRAS improperly handles an uninitialized resource, which can lead to unintended information disclosure over a network. An attacker without any privileges (PR:N) can exploit this vulnerability remotely (AV:N) but requires user interaction (UI:R), such as convincing a user to initiate a connection or action that triggers the flaw. The vulnerability does not affect the integrity or availability of the system but can lead to high confidentiality impact by leaking sensitive information. The CVSS v3.1 base score is 6.5, indicating a medium severity level. No known exploits have been observed in the wild, and no official patches have been released as of the publication date (May 13, 2025). The vulnerability was reserved in March 2025 and publicly disclosed shortly thereafter. Given the nature of RRAS, this vulnerability could expose network configuration details, authentication tokens, or other sensitive data transmitted or processed by RRAS, potentially aiding further attacks or reconnaissance. Since Windows 10 Version 1507 is an early release version, many modern systems may not be affected, but legacy or specialized environments might still be at risk.

For European organizations, the primary impact of CVE-2025-29959 is the potential unauthorized disclosure of sensitive information over the network. This could include internal routing information, authentication data, or other confidential network details processed by RRAS. Such information leakage can facilitate further targeted attacks, including lateral movement, privilege escalation, or data exfiltration. Organizations in sectors with critical infrastructure, government, finance, or healthcare that rely on legacy Windows 10 Version 1507 systems with RRAS enabled are particularly vulnerable. The confidentiality breach could undermine trust, violate data protection regulations such as GDPR, and lead to compliance penalties. Although the vulnerability does not directly affect system integrity or availability, the indirect consequences of leaked information could be severe. The requirement for user interaction reduces the likelihood of mass exploitation but does not eliminate risk, especially in environments with remote access users. The absence of known exploits in the wild currently limits immediate risk, but the lack of patches necessitates proactive mitigation to prevent future exploitation.

1. Disable RRAS on Windows 10 Version 1507 systems if it is not strictly required, as this removes the attack surface entirely. 2. For systems that must use RRAS, implement strict network segmentation to isolate these systems from untrusted networks and limit exposure. 3. Monitor network traffic for unusual or unauthorized RRAS connection attempts or data flows that could indicate exploitation attempts. 4. Educate users about the risks of interacting with unsolicited network prompts or connections that could trigger the vulnerability. 5. Maintain an inventory of systems running Windows 10 Version 1507 and plan for upgrading to supported Windows versions with active security updates. 6. Apply any forthcoming patches from Microsoft promptly once available. 7. Use endpoint detection and response (EDR) tools to detect anomalous behavior related to RRAS processes. 8. Review and tighten firewall rules to restrict RRAS-related ports and protocols to trusted hosts only. 9. Conduct regular vulnerability assessments and penetration tests focusing on RRAS and remote access services to identify potential exploitation vectors. 10. Coordinate with IT and security teams to ensure incident response plans include scenarios involving RRAS information disclosure.