CVE-2025-11303 identifies a command injection vulnerability in the Belkin F9K1015 router firmware version 1.00.10. The vulnerability resides in an unspecified function accessed via the /goform/mp endpoint, where an attacker can manipulate the 'command' argument to inject arbitrary shell commands. This flaw allows remote attackers to execute commands on the device without requiring authentication or user interaction, significantly increasing the attack surface. The vulnerability is exploitable over the network (AV:N) with low attack complexity (AC:L) and no privileges required (PR:L, indicating limited privileges but no authentication). The impact on confidentiality, integrity, and availability is low to limited but present (VC:L, VI:L, VA:L), meaning attackers can affect the device's operation and potentially disrupt services or gain unauthorized control. The vendor was notified early but has not responded or released patches, and exploit code is publicly available, raising the risk of exploitation. No known exploits are currently observed in the wild, but the public availability of exploit code increases the likelihood of future attacks. The vulnerability affects only firmware version 1.00.10, so other versions may not be impacted. The CVSS 4.0 vector and score of 5.3 reflect a medium severity rating, balancing the ease of remote exploitation against the limited scope of impact. The lack of authentication and user interaction requirements makes this vulnerability particularly concerning for exposed devices. The vulnerability could be leveraged to compromise the router, disrupt network connectivity, or serve as a foothold for lateral movement within affected networks.

For European organizations, the vulnerability poses a risk of unauthorized remote command execution on affected Belkin F9K1015 routers, potentially leading to device compromise, network disruption, or unauthorized access to internal resources. This could impact business continuity, data integrity, and network availability, especially in environments where these routers serve as critical network gateways or are deployed in sensitive operational contexts. The lack of vendor response and patch availability increases the window of exposure. Attackers exploiting this vulnerability could disrupt services or use compromised routers as pivot points for further attacks within corporate or governmental networks. The impact is heightened in sectors with critical infrastructure or where network segmentation is weak. Organizations relying on these devices for remote access or VPN termination may face increased risks of interception or manipulation of traffic. The medium severity rating suggests that while the vulnerability is serious, it may not lead to full network compromise without additional vulnerabilities or misconfigurations. However, the ease of exploitation and public exploit availability necessitate urgent attention to prevent potential incidents.

Since no official patch or vendor response is available, European organizations should implement compensating controls immediately. These include isolating affected Belkin F9K1015 devices from direct internet exposure by placing them behind firewalls or VPNs that restrict access to the /goform/mp endpoint. Network segmentation should be enforced to limit the router's access to critical internal systems. Monitoring network traffic for unusual requests targeting the /goform/mp path or anomalous command execution patterns on the device is critical. Organizations should consider replacing affected devices with updated or alternative hardware that is not vulnerable. If replacement is not immediately feasible, disabling remote management features or restricting management access to trusted IP addresses can reduce risk. Regularly auditing device firmware versions and configurations will help identify vulnerable devices. Additionally, implementing intrusion detection/prevention systems (IDS/IPS) with signatures for known exploit attempts can provide early warning. Finally, organizations should maintain an incident response plan tailored to router compromise scenarios to respond quickly if exploitation is detected.