CVE-2025-11303 is a command injection vulnerability identified in the Belkin F9K1015 router, specifically affecting firmware version 1.00.10. The vulnerability resides in an unspecified function within the /goform/mp endpoint, where manipulation of a command argument allows an attacker to inject arbitrary commands. This flaw can be exploited remotely without requiring user interaction or prior authentication, making it particularly dangerous. The vulnerability's CVSS 4.0 base score is 5.3 (medium severity), reflecting that while the attack vector is network-based with low complexity and no user interaction, it requires low privileges and results in low impact on confidentiality, integrity, and availability. The vendor has not responded to disclosure attempts, and no patches or mitigations have been released. Although no known exploits are currently observed in the wild, the public availability of exploit details increases the risk of exploitation. Command injection vulnerabilities typically allow attackers to execute arbitrary system commands, potentially leading to full device compromise, unauthorized network access, or pivoting to internal networks. Given the router’s role as a network gateway, exploitation could disrupt network availability, compromise sensitive data, or facilitate further attacks on connected systems.

For European organizations, the impact of this vulnerability can be significant, especially for small and medium enterprises (SMEs) and home offices relying on Belkin F9K1015 routers for internet connectivity. Successful exploitation could lead to unauthorized control over network traffic, interception of sensitive communications, or disruption of network services. This could result in data breaches, loss of business continuity, and reputational damage. Critical infrastructure or organizations with less mature cybersecurity postures may be particularly vulnerable. Additionally, since the exploit requires no user interaction and can be initiated remotely, attackers could automate attacks at scale, increasing the risk of widespread compromise. The lack of vendor response and patches exacerbates the threat, leaving affected devices exposed for extended periods. European organizations with remote or hybrid work setups relying on these routers are at increased risk, as attackers could leverage this vulnerability to gain footholds in corporate networks.

Given the absence of official patches, European organizations should implement immediate compensating controls. First, isolate affected Belkin F9K1015 devices from critical internal networks and restrict their management interfaces to trusted IP addresses only, preferably via firewall rules. Disable remote management features if enabled, especially access to the /goform/mp endpoint. Network segmentation should be enforced to limit lateral movement from compromised routers. Monitor network traffic for unusual command injection patterns or unexpected outbound connections originating from these devices. Where possible, replace affected routers with models from vendors with active security support and timely patching. Additionally, implement intrusion detection/prevention systems (IDS/IPS) tuned to detect command injection attempts targeting router management interfaces. Regularly audit router firmware versions and configurations to ensure no unauthorized changes occur. Finally, educate IT staff about this vulnerability and encourage vigilance for signs of compromise.