CVE-2025-11293 is a high-severity buffer overflow vulnerability affecting the Belkin F9K1015 router, specifically version 1.00.10. The vulnerability arises from improper handling of the 'max_Conn' argument in the /goform/formConnectionSetting endpoint. An attacker can remotely manipulate this parameter to trigger a buffer overflow condition. This type of vulnerability can lead to arbitrary code execution, denial of service, or system compromise depending on the exploit payload. The vulnerability does not require user interaction and can be exploited remotely over the network, increasing its risk profile. The CVSS 4.0 score of 8.7 reflects the ease of exploitation (low attack complexity), no privileges required, and no user interaction needed, with high impact on confidentiality, integrity, and availability. The vendor, Belkin, was contacted early but has not responded or provided a patch, and no official remediation is currently available. Although no known exploits have been observed in the wild yet, the public disclosure of the exploit code increases the likelihood of active exploitation attempts. The affected functionality is part of the router's web interface, which is commonly exposed to local networks and sometimes to the internet, depending on configuration. This vulnerability could allow attackers to gain control over the router, intercept or manipulate network traffic, or pivot into internal networks.

For European organizations, this vulnerability poses significant risks, especially for small and medium enterprises (SMEs) and home office environments that commonly use consumer-grade Belkin routers like the F9K1015. Compromise of such routers can lead to interception of sensitive communications, insertion of malicious payloads into network traffic, and unauthorized access to internal resources. Given the router's role as a network gateway, successful exploitation could disrupt business operations through denial of service or enable lateral movement by attackers. The lack of vendor response and patch availability increases exposure time, potentially affecting critical infrastructure if these devices are deployed in industrial or operational technology environments. Additionally, the vulnerability could be leveraged in botnet campaigns or as part of broader cyber espionage efforts targeting European entities. The high CVSS score and remote exploitability without authentication make this a pressing threat that could impact confidentiality, integrity, and availability of organizational networks.

1. Immediate mitigation should include isolating affected Belkin F9K1015 devices from untrusted networks, especially the internet, to reduce exposure to remote attacks. 2. Network administrators should implement strict firewall rules to block access to the router's web management interface from outside the local network. 3. Monitor network traffic for unusual activity or signs of exploitation attempts targeting the /goform/formConnectionSetting endpoint. 4. Replace or upgrade affected devices with routers from vendors that provide timely security updates and patches. 5. If replacement is not immediately feasible, consider deploying network segmentation to limit the impact of a compromised router. 6. Employ intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics that can detect exploitation attempts of this buffer overflow. 7. Regularly audit and update router firmware and configurations, and subscribe to vendor and security advisories for any future patches or mitigations. 8. Educate users and IT staff about the risks of using unsupported or unpatched network devices.