CVE-2025-11293 identifies a buffer overflow vulnerability in the Belkin F9K1015 router, specifically in firmware version 1.00.10. The vulnerability resides in the handling of the max_Conn parameter within the /goform/formConnectionSetting endpoint. An attacker can remotely send crafted requests manipulating this parameter to overflow a buffer, potentially overwriting memory and enabling arbitrary code execution or causing the device to crash (denial of service). The attack vector requires no user interaction and no prior authentication, increasing the risk of widespread exploitation. The vulnerability was publicly disclosed shortly after discovery, with the vendor contacted but not responding or releasing a patch. The CVSS 4.0 base score of 8.7 reflects the high impact on confidentiality, integrity, and availability, combined with low attack complexity and no required privileges. The lack of a patch and public exploit code availability heighten the urgency for mitigation. This vulnerability affects network infrastructure devices that are often deployed in enterprise and home environments, making it a critical concern for network security.

For European organizations, this vulnerability poses a significant threat to network infrastructure stability and security. Exploitation could lead to unauthorized remote code execution, allowing attackers to gain control over the router, intercept or manipulate network traffic, and pivot into internal networks. This could result in data breaches, disruption of business operations, and compromise of sensitive information. The denial of service impact could interrupt connectivity, affecting productivity and critical services. Organizations relying on Belkin F9K1015 routers in their network perimeter or internal segments are particularly vulnerable. The absence of vendor patches increases the risk window, potentially enabling threat actors to exploit this flaw in targeted attacks or automated scanning campaigns. Critical sectors such as finance, healthcare, and government in Europe could face operational and reputational damage if exploited.

Until an official patch is released, European organizations should implement the following mitigations: 1) Restrict access to the /goform/formConnectionSetting endpoint by implementing firewall rules or access control lists limiting management interface exposure to trusted IPs only. 2) Segment networks to isolate vulnerable routers from critical assets and sensitive data. 3) Monitor network traffic for anomalous requests targeting the max_Conn parameter or unusual activity on the router’s management interfaces. 4) Disable remote management features if not strictly necessary to reduce attack surface. 5) Employ intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics to detect exploitation attempts. 6) Maintain up-to-date inventories of network devices to identify and prioritize vulnerable units. 7) Engage with Belkin or authorized vendors for firmware updates and apply patches promptly once available. 8) Consider replacing affected devices with models from vendors with active security support if patches are delayed.