CVE-2025-70651 identifies a stack overflow vulnerability in the Tenda AX-1803 router firmware version 1.0.0.1. The flaw exists in the handling of the ssid parameter within the form_fast_setting_wifi_set function. When a specially crafted request is sent to the device, the stack overflow can be triggered, leading to a Denial of Service (DoS) condition by crashing or rebooting the router. This vulnerability does not require authentication or user interaction, making it potentially exploitable remotely by an attacker with network access to the device's management interface. The absence of a CVSS score and known exploits in the wild suggests it is either newly discovered or not yet weaponized. However, the impact on availability is significant because routers are critical network infrastructure components. The vulnerability could disrupt internet connectivity and internal communications for affected organizations. The lack of patch information indicates that vendors may not have released a fix yet, emphasizing the need for proactive mitigation. This vulnerability is particularly relevant for environments where Tenda AX-1803 routers are deployed, especially in small to medium enterprises or home office settings where security controls might be less stringent.

For European organizations, exploitation of this vulnerability could lead to network outages and service disruptions, impacting business continuity and productivity. Since the router is a gateway device, a DoS condition could isolate internal networks from the internet or other critical resources. This could affect remote work capabilities, cloud service access, and internal communications. Additionally, repeated crashes might cause hardware degradation or require manual intervention to restore service. Organizations relying on Tenda AX-1803 devices without segmentation or access controls on management interfaces are at higher risk. The impact is primarily on availability, with no direct evidence of confidentiality or integrity compromise. However, denial of service on network infrastructure can indirectly affect security monitoring and incident response capabilities.

1. Monitor vendor communications closely for firmware updates addressing this vulnerability and apply patches promptly once available. 2. Restrict access to router management interfaces by implementing network segmentation and firewall rules limiting access to trusted IP addresses only. 3. Disable remote management features if not required to reduce the attack surface. 4. Implement network monitoring to detect unusual or malformed requests targeting router management endpoints. 5. Consider replacing affected devices with models from vendors with stronger security track records if patches are delayed. 6. Educate network administrators on the risks of exposing router configuration interfaces to untrusted networks. 7. Maintain regular backups of router configurations to enable rapid recovery in case of device failure.