CVE-2025-29835 is a security vulnerability classified as an out-of-bounds read (CWE-125) found in the Windows Routing and Remote Access Service (RRAS) component of Microsoft Windows 10 Version 1507 (build 10.0.10240.0). The flaw allows an attacker to send specially crafted network packets to the RRAS service, causing it to read memory outside the intended buffer boundaries. This out-of-bounds read can lead to the disclosure of sensitive information from the system's memory over the network. The vulnerability does not require the attacker to have any privileges on the target system (PR:N), but it does require user interaction (UI:R), such as the user accepting a connection or triggering RRAS functionality. The CVSS 3.1 vector indicates the attack is network-based (AV:N), with low attack complexity (AC:L), and results in a high impact on confidentiality (C:H) but no impact on integrity or availability (I:N/A:N). The vulnerability was published on May 13, 2025, with no known exploits in the wild and no patches currently available. RRAS is often used for VPN and routing services, meaning systems exposing RRAS to untrusted networks are particularly vulnerable. The vulnerability's root cause is improper bounds checking in RRAS code, leading to memory disclosure. This type of vulnerability can be leveraged to gather sensitive data that may facilitate further attacks or reconnaissance.

For European organizations, the primary impact of CVE-2025-29835 is the potential unauthorized disclosure of sensitive information from systems running Windows 10 Version 1507 with RRAS enabled. This can compromise confidentiality, exposing credentials, configuration data, or other sensitive memory contents to remote attackers. Sectors such as government, critical infrastructure, telecommunications, and enterprises relying on legacy Windows 10 systems for routing or VPN services are at higher risk. The information leakage could be used to escalate attacks, conduct espionage, or prepare for more damaging exploits. Although the vulnerability does not affect system integrity or availability directly, the confidentiality breach can undermine trust and compliance with data protection regulations like GDPR. The lack of patches increases the window of exposure, especially for organizations slow to upgrade legacy systems. Attackers could exploit this vulnerability remotely without authentication, increasing the threat surface for exposed RRAS services.

1. Disable the Routing and Remote Access Service (RRAS) on Windows 10 Version 1507 systems if it is not essential to business operations. 2. Restrict network access to RRAS services by implementing strict firewall rules limiting inbound connections to trusted IP addresses or VPN clients only. 3. Prioritize upgrading affected systems from Windows 10 Version 1507 to a supported and patched Windows version to eliminate the vulnerability. 4. Monitor network traffic for unusual or malformed packets targeting RRAS ports to detect potential exploitation attempts. 5. Employ network segmentation to isolate legacy systems running RRAS from critical infrastructure and sensitive data environments. 6. Educate users about the risks of interacting with unsolicited network connections that could trigger the vulnerability. 7. Stay updated with Microsoft advisories for any forthcoming patches or mitigations and apply them promptly once available. 8. Conduct regular vulnerability assessments and penetration testing focusing on RRAS exposure and related attack vectors.