CVE-2026-4552 identifies a stack-based buffer overflow vulnerability in the Tenda F453 router firmware version 1.0.0.3. The flaw resides in the fromVirtualSer function of the /goform/VirtualSer endpoint, which is part of the Parameters Handler component. The vulnerability is triggered by sending a specially crafted request that manipulates the 'page' argument, causing the application to write beyond the allocated stack buffer. This overflow can corrupt the stack, potentially allowing an attacker to execute arbitrary code remotely or crash the device, resulting in denial of service. The attack vector is network-based and does not require authentication or user interaction, making it highly accessible to remote attackers. The CVSS 4.0 base score is 8.7, reflecting high severity due to the ease of exploitation (low attack complexity), no privileges required, and the potential for complete compromise of the device's confidentiality, integrity, and availability. Although no exploits have been observed in the wild yet, the public disclosure of the vulnerability increases the likelihood of exploitation attempts. The affected product, Tenda F453, is a consumer-grade router commonly deployed in small office and home environments, which may be exposed to the internet or untrusted networks. The lack of an official patch at the time of disclosure necessitates interim mitigations to reduce exposure.

The impact of CVE-2026-4552 is significant for organizations and individuals using the Tenda F453 router with firmware version 1.0.0.3. Exploitation can lead to remote code execution, allowing attackers to take full control of the device, intercept or manipulate network traffic, and pivot into internal networks. This compromises confidentiality by exposing sensitive data, integrity by allowing unauthorized modifications, and availability by causing device crashes or persistent denial of service. For enterprises relying on these routers for network connectivity, this could lead to operational disruptions and data breaches. The vulnerability's remote, unauthenticated nature increases the risk of widespread exploitation, especially in environments where these devices are directly accessible from the internet. Additionally, compromised routers can be enlisted into botnets or used as launch points for further attacks, amplifying the threat landscape. The absence of a patch at disclosure time means organizations must rely on network segmentation and access controls to mitigate risk temporarily.

1. Monitor Tenda's official channels for firmware updates addressing CVE-2026-4552 and apply patches promptly once available. 2. Restrict access to the router's management interface by implementing network-level controls such as firewall rules or VPNs to limit exposure to trusted networks only. 3. Disable remote management features if not required, especially access to the /goform/VirtualSer endpoint or similar administrative interfaces. 4. Employ network segmentation to isolate vulnerable devices from critical infrastructure and sensitive data environments. 5. Use intrusion detection/prevention systems (IDS/IPS) to monitor and block suspicious traffic patterns targeting the vulnerable parameter. 6. Conduct regular security assessments and vulnerability scans to identify devices running the affected firmware version. 7. Educate users and administrators about the risks of exposing consumer-grade routers to the internet without adequate protections. 8. Consider replacing outdated or unsupported devices with models that receive timely security updates and have robust security features.