The vulnerability CVE-2025-56085 is an OS command injection flaw in the Ruijie RG-EW1200 wireless router firmware version EW_3.0(1)B11P227_EW1200_11130208RG-EW1200 V1.00. It resides in the module_set function within the Lua script located at /usr/local/lua/dev_config/config_retain.lua. An attacker can exploit this vulnerability by sending a crafted POST request to the module_set endpoint, which fails to properly sanitize input parameters before passing them to system-level command execution functions. This lack of input validation allows arbitrary commands to be executed on the underlying operating system with the privileges of the router's web server process. Since the vulnerability does not require authentication, it can be exploited remotely by anyone able to reach the device's management interface, typically exposed on internal networks or potentially on the internet if misconfigured. The impact of exploitation includes full compromise of the router, enabling attackers to manipulate network traffic, deploy malware, or use the device as a foothold for further attacks within the network. No CVSS score has been assigned yet, and no public exploits have been reported, but the technical details indicate a high-risk vulnerability. The affected product is a network device commonly used in enterprise and possibly critical infrastructure environments, increasing the potential impact of exploitation. The vulnerability was reserved in August 2025 and published in December 2025, indicating recent discovery and disclosure.

For European organizations, this vulnerability poses a significant risk due to the potential for complete device compromise without authentication. Attackers could intercept or manipulate sensitive data passing through the router, disrupt network availability, or use the compromised device as a launchpad for lateral movement within corporate or critical infrastructure networks. Organizations relying on Ruijie RG-EW1200 routers in sectors such as telecommunications, government, finance, and energy could face operational disruptions and data breaches. The lack of public exploits currently limits immediate widespread attacks, but the ease of exploitation and critical nature of the device increase the urgency for mitigation. Additionally, if these routers are exposed to the internet or poorly segmented internal networks, the attack surface expands significantly, increasing the likelihood of exploitation. The impact extends beyond individual organizations to potentially affect national infrastructure and services that depend on secure and reliable network equipment.

1. Immediately restrict access to the management interfaces of Ruijie RG-EW1200 routers to trusted internal networks only, using firewall rules and network segmentation. 2. Monitor network traffic for unusual POST requests targeting the module_set endpoint or other suspicious activity indicative of exploitation attempts. 3. If available, apply vendor-provided patches or firmware updates addressing this vulnerability as soon as they are released. 4. In the absence of patches, consider disabling or limiting the functionality of the vulnerable module_set endpoint if possible through configuration changes. 5. Employ intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics to detect command injection attempts targeting this device. 6. Conduct regular security audits and vulnerability assessments on network devices to identify and remediate similar issues proactively. 7. Educate network administrators about the risks of exposing management interfaces and the importance of strong access controls and monitoring.