CVE-2025-15254 is an OS command injection vulnerability identified in the Tenda W6-S router firmware version 1.0.0.4(510). The vulnerability resides in the ATE Service component, specifically within the TendaAte function accessible through the /goform/ate endpoint. This flaw allows an unauthenticated remote attacker to inject and execute arbitrary operating system commands on the device by manipulating input parameters sent to this endpoint. The vulnerability does not require user interaction or prior authentication, making it remotely exploitable over the network. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:L - low privileges, but here it is actually no authentication needed), no user interaction (UI:N), and low impact on confidentiality, integrity, and availability (VC:L, VI:L, VA:L). The exploit code has been publicly disclosed, increasing the risk of exploitation, although no active exploitation has been reported yet. This vulnerability could allow attackers to execute arbitrary commands, potentially leading to unauthorized control, data leakage, or disruption of device functionality. The lack of vendor-provided patches at the time of disclosure increases exposure. The vulnerability affects a specific firmware version, so devices running other versions may not be vulnerable. The Tenda W6-S is a consumer-grade Wi-Fi 6 router, often deployed in small offices and home environments, which could be part of enterprise branch networks or home office setups in European organizations.

For European organizations, exploitation of CVE-2025-15254 could lead to unauthorized remote code execution on affected Tenda W6-S routers, compromising device confidentiality, integrity, and availability. Attackers could leverage this to intercept or manipulate network traffic, pivot into internal networks, or disrupt connectivity. This is particularly concerning for organizations relying on these routers for critical network access or remote work infrastructure. The impact is amplified in sectors with sensitive data or critical operations, such as finance, healthcare, and government. The medium severity score reflects limited impact scope and relatively low complexity, but the lack of authentication and remote exploitability increase risk. Organizations with widespread deployment of Tenda W6-S devices or those lacking network segmentation and monitoring controls face higher exposure. Additionally, the public availability of exploit code raises the likelihood of opportunistic attacks targeting unpatched devices across Europe.

To mitigate CVE-2025-15254, organizations should first verify if they are using the affected Tenda W6-S firmware version 1.0.0.4(510). If so, they should immediately seek firmware updates or patches from Tenda; if unavailable, consider upgrading to a newer, unaffected firmware version or replacing the device. Network administrators should restrict access to the /goform/ate endpoint by implementing firewall rules or access control lists that limit management interface exposure to trusted internal networks only. Employ network segmentation to isolate vulnerable devices from critical infrastructure. Enable logging and monitoring for unusual requests targeting the /goform/ate endpoint to detect exploitation attempts. Use intrusion detection/prevention systems (IDS/IPS) with signatures for this vulnerability if available. Educate users and administrators about the risks of using outdated router firmware and the importance of timely updates. For home office scenarios, advise users to change default credentials and disable remote management features if not needed. Finally, maintain an inventory of network devices to quickly identify and remediate vulnerable hardware.