CVE-2025-50756 is a command injection vulnerability identified in the Wavlink WN535K3 router firmware version 20191010. The vulnerability exists in the set_sys_adm function, specifically through the newpass parameter. An attacker can exploit this flaw by sending a crafted request that injects arbitrary commands, which the device executes with the privileges of the affected function. Command injection vulnerabilities are critical because they allow attackers to execute arbitrary system commands remotely, potentially leading to full device compromise. In this case, the vulnerability affects a network device, which often has privileged access to internal networks and sensitive data flows. The lack of a CVSS score indicates that the vulnerability is newly published and has not yet been fully assessed or scored. No patches or known exploits in the wild have been reported at this time, but the nature of the vulnerability suggests a high risk if exploited. The vulnerability does not specify affected versions beyond the 20191010 firmware, but it is likely limited to that or similar versions. The absence of authentication requirements or user interaction details is not explicitly stated, but command injection in router management interfaces often can be triggered remotely without authentication, increasing the severity.

For European organizations, this vulnerability poses a significant risk to network security and operational continuity. Wavlink routers are used in various small to medium business environments and possibly in some enterprise edge deployments. Exploitation could allow attackers to gain unauthorized control over network infrastructure, leading to interception or manipulation of network traffic, lateral movement within corporate networks, and potential data exfiltration. The compromise of network devices can also facilitate launching further attacks such as man-in-the-middle, ransomware, or persistent espionage campaigns. Given the critical role of routers in network infrastructure, any disruption or compromise could impact availability and integrity of communications. Additionally, regulatory frameworks such as GDPR impose strict requirements on protecting personal data, and a breach stemming from this vulnerability could lead to legal and financial penalties for affected organizations.

Organizations should immediately identify any Wavlink WN535K3 devices running the vulnerable firmware (20191010). Since no official patches are currently available, mitigation should focus on network segmentation to isolate vulnerable devices from critical assets and restrict management interface access to trusted administrative networks only. Implement strict firewall rules to block unauthorized access to router management ports from external or untrusted internal networks. Monitoring network traffic for unusual commands or patterns targeting the newpass parameter can help detect exploitation attempts. If possible, disable remote management features or change default credentials to reduce exposure. Engage with Wavlink support channels to obtain information on forthcoming patches or firmware updates. Additionally, consider replacing vulnerable devices with models that have active security support. Regularly review and update device firmware as part of a comprehensive vulnerability management program.