CVE-2025-56123 is an OS Command Injection vulnerability identified in the Ruijie RG-EW1200G PRO series routers, spanning firmware versions V1.00 through V4.00. The vulnerability resides in the module_get function within the /usr/local/lua/dev_sta/networkConnect.lua script. Attackers with low privileges can exploit this flaw by sending a crafted POST request that injects arbitrary commands into the operating system shell. This type of vulnerability (CWE-78) allows execution of arbitrary commands with the privileges of the affected process, potentially leading to full device compromise. The vulnerability has a CVSS v3.1 base score of 8.8, reflecting its high impact on confidentiality, integrity, and availability, with network attack vector, low attack complexity, and no user interaction required. Although no known exploits are currently reported in the wild, the vulnerability's characteristics make it a critical risk for affected environments. The lack of available patches at the time of publication necessitates immediate defensive measures to prevent exploitation. The Ruijie RG-EW1200G PRO devices are typically used in enterprise and possibly critical infrastructure networks, making this vulnerability particularly concerning for organizations relying on these devices for network connectivity and security functions.

Exploitation of CVE-2025-56123 can lead to complete compromise of the affected Ruijie RG-EW1200G PRO devices, allowing attackers to execute arbitrary commands with the privileges of the network service. This can result in unauthorized access to sensitive data, disruption of network services, and potential pivoting into internal networks. For European organizations, this could mean exposure of confidential information, operational downtime, and damage to reputation. Critical infrastructure sectors using these devices may face increased risks of sabotage or espionage. The vulnerability's ease of exploitation and high impact on confidentiality, integrity, and availability make it a significant threat. Furthermore, the absence of public exploits currently may lead to a false sense of security, but proactive measures are essential to prevent future attacks. The potential for lateral movement within networks also raises concerns about broader organizational impact beyond the initial device compromise.

1. Immediately restrict network access to the management interfaces of Ruijie RG-EW1200G PRO devices, limiting connections to trusted administrators and management networks only. 2. Implement strict firewall rules and network segmentation to isolate these devices from general user networks and the internet. 3. Monitor network traffic for unusual POST requests targeting the module_get function or suspicious command injection patterns. 4. Employ intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics capable of detecting command injection attempts. 5. Engage with Ruijie Networks for official patches or firmware updates addressing this vulnerability and apply them promptly once available. 6. Conduct thorough audits of affected devices to identify any signs of compromise or unauthorized changes. 7. Educate network administrators about the vulnerability and the importance of secure device configuration and access controls. 8. Consider temporary device replacement or alternative solutions if patching is delayed and risk is unacceptable. 9. Maintain up-to-date backups of device configurations to enable rapid recovery if compromise occurs.