CVE-2026-3732 is a stack-based buffer overflow vulnerability identified in the Tenda F453 router firmware version 1.0.0.3. The vulnerability arises from the use of the unsafe strcpy function in the /goform/exeCommand endpoint, which copies user-supplied input (cmdinput) into a fixed-size buffer without proper bounds checking. This improper input validation allows an attacker to send a specially crafted request that overflows the stack buffer, potentially overwriting the return address or other control data on the stack. Because the vulnerable endpoint is accessible remotely and does not require authentication or user interaction, an attacker can exploit this flaw over the network to execute arbitrary code with elevated privileges or cause a denial of service by crashing the device. The CVSS v4.0 base score of 8.7 reflects the high impact on confidentiality, integrity, and availability, combined with the ease of remote exploitation. While no known exploits have been observed in the wild yet, the public disclosure of the vulnerability increases the likelihood of active exploitation attempts. The affected product, Tenda F453, is a consumer-grade router, and the vulnerability could be leveraged to compromise home or small office networks, potentially allowing attackers to pivot into internal networks or intercept sensitive communications.

The impact of CVE-2026-3732 is significant for organizations and individuals using the Tenda F453 router with firmware version 1.0.0.3. Successful exploitation can lead to remote code execution, allowing attackers to gain full control over the device. This can result in interception or manipulation of network traffic, unauthorized access to internal networks, deployment of malware, or disruption of network services. The vulnerability compromises confidentiality, integrity, and availability of affected systems. For enterprises relying on these routers for network connectivity, the risk extends to potential lateral movement within corporate networks, data breaches, and operational downtime. The lack of authentication and user interaction requirements lowers the barrier for attackers, increasing the threat level. Additionally, compromised routers can be recruited into botnets or used as launch points for further attacks, amplifying the broader cybersecurity risk.

To mitigate CVE-2026-3732, organizations should immediately check if they are using Tenda F453 routers running firmware version 1.0.0.3. Since no official patch links are currently available, users should monitor Tenda’s official channels for firmware updates addressing this vulnerability and apply them promptly once released. In the interim, network administrators should restrict access to the router’s management interfaces by implementing network segmentation and firewall rules to block external access to the /goform/exeCommand endpoint. Disabling remote management features or restricting them to trusted IP addresses can reduce exposure. Employing intrusion detection/prevention systems (IDS/IPS) with signatures targeting buffer overflow attempts on this endpoint can help detect exploitation attempts. Regularly auditing router configurations and monitoring network traffic for anomalies is also recommended. Finally, consider replacing affected devices with models that have received security updates if timely patches are unavailable.