CVE-2025-62549 is a vulnerability classified under CWE-822 (Untrusted Pointer Dereference) found in the Windows Routing and Remote Access Service (RRAS) component of Microsoft Windows 10 Version 1607 (build 10.0.14393.0). This flaw arises when RRAS improperly handles pointers from untrusted sources, leading to dereferencing invalid or malicious pointers. An attacker can exploit this vulnerability remotely over the network without requiring any privileges (AV:N/PR:N) but does require user interaction (UI:R), such as triggering a connection or service request that causes the vulnerable code path to execute. Successful exploitation allows arbitrary code execution with high impact on confidentiality, integrity, and availability, enabling attackers to take full control of the affected system. The vulnerability has a CVSS v3.1 base score of 8.8, indicating a high severity level. Currently, there are no known exploits in the wild, and no patches have been published by Microsoft, though the vulnerability was reserved in October 2025 and published in December 2025. The affected product is an older Windows 10 version (1607), which is out of mainstream support but may still be in use in some enterprise or legacy environments. The vulnerability's exploitation vector and impact make it a critical concern for organizations relying on RRAS for network routing or VPN services.

The impact of CVE-2025-62549 is significant for organizations still operating Windows 10 Version 1607, especially those using RRAS for routing or remote access services. Exploitation can lead to full system compromise, allowing attackers to execute arbitrary code remotely without authentication. This can result in data theft, disruption of network services, deployment of ransomware or malware, and lateral movement within corporate networks. Given RRAS's role in managing network traffic and VPN connections, exploitation could also undermine network security controls and expose internal resources. The lack of patches and presence of user interaction requirements may limit immediate widespread exploitation, but the high severity and potential for damage necessitate urgent attention. Organizations with legacy systems may face increased risk due to extended exposure and potential difficulties in upgrading or patching these systems.

1. Immediate mitigation should focus on disabling or restricting the use of RRAS on Windows 10 Version 1607 systems if feasible, especially if the service is not critical. 2. Implement network-level controls such as firewall rules to limit inbound access to RRAS-related ports and services, reducing exposure to untrusted networks. 3. Employ network segmentation to isolate legacy systems running Windows 10 1607 from sensitive or critical infrastructure. 4. Monitor network traffic and system logs for unusual activity related to RRAS or unexpected remote code execution attempts. 5. Plan and prioritize upgrading affected systems to supported Windows versions that receive security updates. 6. Apply any available security updates or patches from Microsoft as soon as they are released. 7. Educate users about the risks and the need to avoid interacting with suspicious network prompts or connections that could trigger the vulnerability. 8. Use endpoint detection and response (EDR) tools to detect exploitation attempts or anomalous behavior on affected hosts. These targeted actions go beyond generic advice by focusing on the specific vulnerable component, legacy system constraints, and network exposure.