CVE-2025-50260 is a buffer overflow vulnerability identified in the Tenda AC6 router firmware version 15.03.05.16_multi. The flaw exists within the formSetFirewallCfg function, specifically triggered via the firewallEn parameter. Buffer overflow vulnerabilities occur when a program writes more data to a buffer than it can hold, potentially overwriting adjacent memory. In this case, improper input validation or bounds checking on the firewallEn parameter allows an attacker to overflow the buffer. This can lead to arbitrary code execution, denial of service, or system instability. Since the vulnerability is in the firewall configuration function, exploitation could allow an attacker to manipulate firewall settings or gain elevated privileges on the device. The Tenda AC6 is a widely used consumer-grade wireless router, often deployed in home and small office environments. No CVSS score has been assigned yet, and no known exploits are currently reported in the wild. However, the presence of a buffer overflow in a network-facing device firmware is a significant security concern. The lack of a patch or mitigation details indicates that affected users may remain vulnerable until an official update is released. Attackers could potentially craft malicious requests to the router's management interface to exploit this vulnerability remotely if the interface is exposed or accessible within the local network.

For European organizations, the impact of this vulnerability could be substantial, especially for small and medium-sized enterprises (SMEs) and home office setups relying on Tenda AC6 routers. Exploitation could lead to unauthorized access to internal networks, interception or manipulation of network traffic, and disruption of internet connectivity. This could compromise confidentiality by exposing sensitive data, integrity by altering firewall rules or network configurations, and availability by causing device crashes or network outages. Given the router's role as a network gateway, successful exploitation could serve as a foothold for lateral movement within corporate networks or as a launch point for further attacks. Additionally, compromised routers could be conscripted into botnets, amplifying the threat landscape. The absence of known exploits currently reduces immediate risk, but the vulnerability's publication may prompt attackers to develop exploits, increasing future risk. Organizations with remote or unmanaged network devices are particularly at risk if these routers are not properly secured or updated.

Organizations should immediately inventory their network infrastructure to identify any Tenda AC6 routers running the vulnerable firmware version 15.03.05.16_multi. Until an official patch is released, it is critical to restrict access to the router's management interface by disabling remote administration and limiting local network access to trusted devices only. Network segmentation should be employed to isolate vulnerable devices from critical systems. Monitoring network traffic for unusual activity or attempts to exploit firewall configuration interfaces can provide early detection. Users should regularly check Tenda's official channels for firmware updates and apply patches promptly once available. As a longer-term measure, consider replacing consumer-grade routers with enterprise-grade devices that offer more robust security features and timely patch management. Additionally, implementing network-level protections such as intrusion detection/prevention systems (IDS/IPS) can help detect and block exploitation attempts targeting this vulnerability.