The vulnerability identified as CVE-2025-63458 affects the Tenda AX-1803 router, version 1.0.0.1. It is a stack overflow issue located in the timeZone parameter within the form_fast_setting_wifi_set function. This function likely handles configuration settings related to Wi-Fi fast setup, and improper input validation on the timeZone parameter allows an attacker to overflow the stack. A crafted HTTP or similar request targeting this parameter can trigger the overflow, causing the router's firmware to crash or reboot, resulting in a Denial of Service (DoS). The vulnerability does not require authentication or user interaction, making it easier for remote attackers to exploit. No public exploits or patches have been reported yet, and the CVSS score is not assigned. The lack of patch links suggests that vendors have not yet released fixes, increasing the urgency for organizations to monitor for updates. The stack overflow impacts the availability of the device by disrupting normal operations, potentially affecting network connectivity for users relying on this router. This vulnerability highlights the importance of secure input handling in embedded device firmware, especially for network infrastructure devices that serve as critical connectivity points.

For European organizations, exploitation of this vulnerability could lead to network outages or intermittent connectivity issues due to router crashes. This can disrupt business operations, especially for small and medium enterprises or branch offices relying on Tenda AX-1803 routers for internet access or internal network connectivity. Critical infrastructure sectors such as healthcare, finance, and manufacturing could experience operational delays or loss of productivity. Additionally, denial of service on network edge devices can be leveraged as part of larger attack campaigns to degrade organizational defenses or cause cascading failures. While the vulnerability does not directly compromise confidentiality or integrity, the loss of availability can have significant operational and reputational impacts. The absence of known exploits reduces immediate risk but also means organizations should proactively prepare. The impact is more pronounced in environments where redundancy is limited or where these routers serve as primary gateways.

Organizations should immediately inventory their network devices to identify any Tenda AX-1803 routers running version 1.0.0.1. Until a vendor patch is available, network administrators should implement access controls to restrict management interface exposure, ideally limiting access to trusted internal networks or VPNs. Deploying network-level intrusion detection/prevention systems (IDS/IPS) with signatures or anomaly detection for malformed requests targeting the timeZone parameter can help detect or block exploitation attempts. Monitoring router logs for unusual crashes or reboots can provide early warning signs. Where possible, replace vulnerable devices with models from vendors with a stronger security track record. Engage with Tenda support channels to obtain firmware updates or mitigation guidance. Additionally, segmenting critical network assets and implementing redundancy can reduce the operational impact of potential DoS events. Educating IT staff about this vulnerability ensures timely response and patch management once fixes are released.