CVE-2025-50641 is a buffer overflow vulnerability identified in the Tenda AC6 router firmware version 15.03.05.16_multi. The flaw exists within the addWifiMacFilter function, specifically triggered via the deviceId parameter. Buffer overflow vulnerabilities occur when input data exceeds the allocated buffer size, leading to memory corruption. In this case, improper input validation or bounds checking on the deviceId parameter allows an attacker to overwrite adjacent memory. This can lead to unpredictable behavior including crashes, denial of service, or potentially arbitrary code execution if exploited successfully. The vulnerability affects the Tenda AC6 router, a consumer-grade wireless access point device commonly used in home and small office environments. No CVSS score is currently assigned, and no public exploits have been reported in the wild as of the publication date (July 1, 2025). The lack of patch information suggests that a fix may not yet be available or publicly disclosed. Given the nature of buffer overflow vulnerabilities, exploitation could allow an attacker to gain elevated privileges on the device or disrupt network connectivity by causing the router to crash or reboot. The attack vector likely requires network access to the router's management interface or a service that processes the addWifiMacFilter function calls, which may be accessible locally or remotely depending on the router's configuration and exposure to the internet.

For European organizations, the impact of this vulnerability can be significant, especially for small and medium enterprises (SMEs) and home office setups relying on Tenda AC6 routers for network connectivity. Successful exploitation could lead to denial of service, disrupting business operations and communications. More critically, if arbitrary code execution is achieved, attackers could pivot into internal networks, intercept or manipulate traffic, or establish persistent footholds. This is particularly concerning for organizations handling sensitive data or critical infrastructure. The vulnerability could also be leveraged in botnet campaigns or as part of broader attacks targeting IoT and network edge devices. Given the widespread use of consumer-grade routers in European households and small businesses, the attack surface is considerable. Furthermore, the lack of a patch and public exploit increases the risk of zero-day exploitation once threat actors develop working exploits. The vulnerability may also affect managed service providers who deploy Tenda AC6 devices for clients, amplifying the potential impact across multiple organizations.

Organizations should immediately inventory their network devices to identify any Tenda AC6 routers running firmware version 15.03.05.16_multi. Until a patch is available, it is critical to restrict access to the router's management interfaces by implementing network segmentation and firewall rules that limit access to trusted hosts only. Disabling remote management features and changing default credentials can reduce exposure. Monitoring network traffic for unusual activity related to MAC filter configuration changes or attempts to exploit the deviceId parameter is advisable. Where possible, replacing vulnerable devices with models from vendors with robust security update practices should be considered. Network administrators should stay alert for firmware updates or advisories from Tenda and apply patches promptly once released. Additionally, implementing network intrusion detection systems (NIDS) with signatures for buffer overflow attempts targeting Tenda routers can provide early warning. Regular backups of router configurations and maintaining an incident response plan tailored to network device compromises will aid in rapid recovery if exploitation occurs.