CVE-2025-11302 is a high-severity buffer overflow vulnerability affecting the Belkin F9K1015 router, specifically version 1.00.10. The vulnerability resides in an unspecified function related to the /goform/formWpsStart endpoint, where manipulation of the 'pinCode' argument can trigger a buffer overflow condition. This flaw allows an attacker to remotely exploit the device without requiring user interaction or prior authentication, as indicated by the CVSS vector (AV:N/AC:L/AT:N/UI:N/PR:L). The buffer overflow can lead to significant impacts on confidentiality, integrity, and availability, potentially enabling remote code execution or denial of service. The vulnerability has been publicly disclosed, and although no known exploits are currently observed in the wild, the exploit code is available, increasing the risk of future attacks. The vendor, Belkin, has not responded to early notifications, and no patches or mitigations have been released at this time. The vulnerability’s CVSS 4.0 score is 8.7, reflecting its high severity and ease of exploitation over the network. The lack of authentication and user interaction requirements combined with high impact on system components makes this a critical concern for organizations using this router model.

For European organizations, this vulnerability poses a significant risk especially to those relying on the Belkin F9K1015 router for network connectivity. Exploitation could lead to unauthorized remote control of network devices, enabling attackers to intercept or manipulate sensitive data, disrupt network availability, or pivot to internal systems for further compromise. This is particularly concerning for small and medium enterprises, home offices, and branch offices where such routers are commonly deployed without rigorous security monitoring. The potential for remote code execution could allow attackers to establish persistent footholds, leading to data breaches or service outages. Given the lack of vendor response and patches, organizations face prolonged exposure. Critical infrastructure operators, financial institutions, and government entities using this hardware could experience operational disruptions or data loss, impacting business continuity and regulatory compliance under frameworks like GDPR.

Immediate mitigation steps include isolating the affected Belkin F9K1015 devices from critical network segments and restricting inbound access to the router’s management interfaces, especially the /goform/formWpsStart endpoint. Network segmentation and firewall rules should be enforced to limit exposure to untrusted networks. Organizations should monitor network traffic for anomalous requests targeting the vulnerable endpoint and implement intrusion detection signatures to detect exploitation attempts. Where possible, replace affected devices with alternative hardware from vendors with active security support. If replacement is not feasible, consider disabling WPS functionality or any web management features that invoke the vulnerable endpoint. Regularly review and update network device inventories to identify impacted units. Engage with Belkin support channels for updates and patches, and subscribe to vulnerability advisories for timely information. Additionally, implement network-level protections such as VPNs and multi-factor authentication for remote access to reduce attack surface.