CVE-2025-8958 is a high-severity stack-based buffer overflow vulnerability affecting the Tenda TX3 router firmware version 16.03.13.11_multi_TDE01. The vulnerability exists in an unspecified functionality related to the /goform/fast_setting_wifi_set endpoint, specifically through manipulation of the 'ssid' argument. An attacker can remotely send a crafted request to this endpoint, causing a stack-based buffer overflow. This type of vulnerability can lead to arbitrary code execution, denial of service, or system compromise without requiring authentication or user interaction. The CVSS 4.0 score of 8.7 reflects the ease of remote exploitation (attack vector: network), no privileges or user interaction needed, and a high impact on confidentiality, integrity, and availability. Although no public exploits are currently known to be in the wild, the exploit code has been disclosed publicly, increasing the risk of exploitation. The vulnerability affects a widely deployed consumer and small office router model, which is often used as a gateway device in home and small business networks. The lack of an official patch or mitigation guidance at this time increases the urgency for affected users to take protective measures. The vulnerability's exploitation could allow attackers to gain control over the router, intercept or manipulate network traffic, or pivot into internal networks.

For European organizations, this vulnerability poses significant risks, especially for small and medium enterprises (SMEs) and home office setups that rely on Tenda TX3 routers for internet connectivity. Successful exploitation could lead to unauthorized access to internal networks, interception of sensitive data, disruption of network services, and potential lateral movement to other critical systems. Given the router’s role as a network gateway, compromise could undermine the confidentiality and integrity of organizational communications. The impact is heightened in sectors with strict data protection requirements under GDPR, as breaches could lead to regulatory penalties and reputational damage. Additionally, the ability to remotely exploit the vulnerability without authentication increases the threat surface, making it attractive to cybercriminals and potentially nation-state actors targeting European infrastructure or businesses. The absence of a patch means organizations must rely on network-level mitigations and monitoring to reduce risk.

1. Network Segmentation: Isolate Tenda TX3 routers from critical internal networks using VLANs or firewall rules to limit potential lateral movement if compromised. 2. Access Control: Restrict remote management interfaces and disable WAN-side access to router configuration pages to prevent external exploitation. 3. Monitoring and Detection: Deploy network intrusion detection systems (NIDS) to monitor for suspicious traffic patterns targeting /goform/fast_setting_wifi_set or unusual SSID parameter payloads. 4. Firmware Updates: Regularly check Tenda’s official channels for firmware updates or security advisories addressing this vulnerability and apply patches promptly once available. 5. Temporary Workarounds: If possible, disable or restrict the vulnerable endpoint (/goform/fast_setting_wifi_set) via router configuration or firewall rules until a patch is released. 6. Device Replacement: For high-risk environments, consider replacing affected Tenda TX3 devices with routers from vendors with active security support and timely patching. 7. User Awareness: Educate users about the risks of using default or outdated router firmware and encourage secure configuration practices.