CVE-2025-70650 is a stack overflow vulnerability identified in the Tenda AX-1806 router firmware version 1.0.0.1. The flaw resides in the formSetMacFilterCfg function, specifically within the deviceList parameter, which is improperly handled, allowing a crafted request to overflow the stack. This overflow can cause the device to crash or reboot, resulting in a Denial of Service (DoS) condition. The vulnerability does not require authentication or user interaction, implying that an attacker could exploit it remotely if they can reach the router's management interface or any exposed service handling this function. The absence of a CVSS score and patches suggests this is a newly disclosed issue with limited public information and no known active exploitation. The impact is primarily on availability, as the router becomes unresponsive or unstable. Tenda AX-1806 routers are typically used in home and small office environments, but their compromise can disrupt network connectivity and potentially affect dependent services. The lack of known exploits provides a window for mitigation before widespread attacks occur. However, the vulnerability's presence in a network edge device makes it a significant risk vector for network disruption.

For European organizations, exploitation of this vulnerability could lead to network outages due to router crashes, impacting business continuity and productivity. Small and medium enterprises (SMEs) and home office setups using Tenda AX-1806 routers are particularly vulnerable, as these devices often lack advanced security controls and monitoring. Disruptions could affect remote work capabilities, VoIP communications, and access to cloud services. Critical infrastructure sectors relying on these routers for network access could face operational interruptions. The denial of service could also be leveraged as part of a larger attack chain to distract or delay incident response. While confidentiality and integrity impacts are not indicated, the availability impact alone can have significant operational consequences. The absence of patches increases the risk window, emphasizing the need for proactive defense measures. European organizations with limited IT security resources may be disproportionately affected due to the device's common use in less managed environments.

1. Immediately restrict access to the router's management interface by limiting it to trusted internal IP addresses and disabling remote management where possible. 2. Implement network segmentation to isolate vulnerable devices from critical network segments and sensitive data. 3. Monitor network traffic for unusual requests targeting the deviceList parameter or abnormal router behavior indicating potential exploitation attempts. 4. Replace or upgrade Tenda AX-1806 routers with models from vendors providing timely security updates and patches. 5. If replacement is not feasible, consider deploying firewall rules to block malformed packets or requests that could trigger the overflow. 6. Educate users and administrators about the vulnerability and encourage vigilance for signs of network instability. 7. Engage with Tenda support channels to obtain information on forthcoming patches or firmware updates addressing this issue. 8. Maintain up-to-date network device inventories to quickly identify and remediate affected devices. 9. Employ intrusion detection/prevention systems (IDS/IPS) tuned to detect exploitation attempts targeting this vulnerability.