CVE-2025-49671 is a vulnerability identified in Microsoft Windows Server 2008 R2 Service Pack 1, specifically within the Routing and Remote Access Service (RRAS) component. The flaw is classified under CWE-200, indicating an exposure of sensitive information to unauthorized actors. The vulnerability allows an attacker to remotely disclose sensitive data over the network without requiring any privileges (PR:N) but does require user interaction (UI:R), such as triggering a connection or response from the target system. The attack vector is network-based (AV:N) with low attack complexity (AC:L). The vulnerability does not impact the integrity or availability of the system but has a high impact on confidentiality (C:H). The scope remains unchanged (S:U), meaning the vulnerability affects only the vulnerable component without impacting other system components. The CVSS v3.1 base score is 6.5, indicating a medium severity level. No public exploits or patches have been reported at the time of publication, and the vulnerability was reserved in June 2025 and published in July 2025. The vulnerability likely arises from improper handling or exposure of sensitive data within RRAS communications or configurations, potentially leaking information such as routing tables, network configurations, or authentication metadata. Given Windows Server 2008 R2 reached end of extended support in January 2020, many systems may remain unpatched or unsupported, increasing risk. Organizations relying on RRAS for VPN or routing services on legacy servers should assess exposure and consider mitigation strategies.

For European organizations, the primary impact is the unauthorized disclosure of sensitive information, which could include network topology, routing details, or other configuration data that could facilitate further attacks such as network reconnaissance or targeted intrusions. Confidentiality breaches could compromise internal network security postures and expose sensitive operational data. Since Windows Server 2008 R2 is an older platform, many organizations in sectors like government, critical infrastructure, manufacturing, and finance may still operate legacy systems vulnerable to this issue. The lack of integrity or availability impact limits the immediate operational disruption, but the information disclosure could be leveraged by advanced persistent threat (APT) actors to plan more damaging attacks. The requirement for user interaction reduces the likelihood of automated widespread exploitation but does not eliminate risk, especially in environments where users initiate RRAS connections frequently. The absence of known exploits in the wild suggests limited current exploitation but also highlights the importance of proactive mitigation before attackers develop weaponized exploits. The medium severity rating indicates a moderate but non-trivial risk that should be addressed promptly, especially in regulated environments subject to data protection laws such as GDPR.

1. Disable RRAS if it is not required, especially on legacy Windows Server 2008 R2 systems, to eliminate the attack surface. 2. If RRAS is necessary, restrict access to RRAS services using network segmentation and firewall rules to limit exposure to trusted networks and users only. 3. Monitor network traffic for unusual RRAS-related activity or unexpected connection attempts that could indicate exploitation attempts. 4. Apply any available security updates or hotfixes from Microsoft as they become available, even if official support has ended, through extended support agreements or third-party patch providers. 5. Implement strict user interaction policies and educate users about the risks of initiating unexpected RRAS connections or responding to unsolicited network prompts. 6. Plan and prioritize migration from Windows Server 2008 R2 to supported Windows Server versions (e.g., 2019 or later) to benefit from ongoing security updates and improved security features. 7. Conduct regular vulnerability assessments and penetration tests focusing on legacy systems and RRAS configurations to identify and remediate exposures. 8. Employ network intrusion detection/prevention systems (IDS/IPS) tuned to detect anomalous RRAS traffic patterns.