CVE-2025-11301 identifies a critical buffer overflow vulnerability in the Belkin F9K1015 router firmware version 1.00.10. The flaw exists in an unspecified function handling requests to the /goform/formWlanSetupWPS endpoint, which processes WLAN setup parameters related to Wi-Fi Protected Setup (WPS). By manipulating the input arguments sent to this endpoint, an attacker can trigger a buffer overflow condition. This vulnerability is remotely exploitable over the network without requiring authentication or user interaction, significantly increasing its risk profile. The buffer overflow can lead to arbitrary code execution, allowing attackers to take full control of the device, disrupt network availability, or intercept and manipulate network traffic. The CVSS v4.0 score of 8.7 reflects the high impact on confidentiality, integrity, and availability, combined with low attack complexity and no prerequisites for exploitation. Although no active exploitation has been reported, a public exploit is available, increasing the likelihood of future attacks. The vendor has not issued any patches or advisories, and attempts to contact them have been unsuccessful, leaving affected devices vulnerable. This vulnerability is particularly concerning for environments relying on these routers for critical network functions, as compromise could lead to lateral movement within internal networks or persistent backdoors. The lack of vendor response necessitates proactive defensive measures by users and administrators.

For European organizations, the impact of CVE-2025-11301 can be severe. Compromise of Belkin F9K1015 routers could lead to unauthorized access to internal networks, interception of sensitive communications, and disruption of network services. This is especially critical for enterprises, government agencies, and critical infrastructure operators that depend on secure and reliable network connectivity. The vulnerability’s remote exploitability without authentication means attackers can target exposed devices directly from the internet or through compromised internal hosts. Given the router’s role as a gateway device, successful exploitation could facilitate further attacks on connected systems, data exfiltration, or deployment of malware. The absence of a patch and vendor support increases the risk of prolonged exposure. Additionally, organizations with regulatory obligations under GDPR and other data protection laws may face compliance risks if breaches occur due to this vulnerability. The potential for widespread exploitation could also impact supply chains and service providers using these devices in their infrastructure.

1. Immediately identify and inventory all Belkin F9K1015 routers running firmware version 1.00.10 within the network. 2. Disable WPS functionality on affected devices if the option is available, as the vulnerability is linked to the WPS setup endpoint. 3. Restrict network access to router management interfaces by implementing strict firewall rules and access control lists, limiting exposure to trusted management networks only. 4. Segment networks to isolate vulnerable devices from critical systems and sensitive data environments to reduce lateral movement risk. 5. Monitor network traffic for unusual activity targeting the /goform/formWlanSetupWPS endpoint or signs of exploitation attempts, using IDS/IPS solutions with custom signatures if necessary. 6. Consider replacing affected devices with models from vendors with active security support and patch management. 7. Regularly review and update network device firmware and configurations to maintain security hygiene. 8. Educate IT staff about this vulnerability and ensure incident response plans include steps for dealing with potential exploitation. 9. Engage with Belkin or authorized resellers for updates or advisories, and track vulnerability disclosures for future patches.