CVE-2026-3272 identifies a buffer overflow vulnerability in the Tenda F453 router firmware version 1.0.0.3, specifically in the fromDhcpListClient function of the /goform/DhcpListClient endpoint within the httpd component. The vulnerability is triggered by manipulating the 'page' argument, which is not properly validated or bounds-checked, leading to a buffer overflow condition. This flaw allows remote attackers to send crafted HTTP requests to the router's management interface, causing memory corruption. Given the router's role in network traffic routing and device management, exploitation could enable attackers to execute arbitrary code remotely, potentially gaining control over the device. The vulnerability has a CVSS 4.0 base score of 8.7, reflecting its high severity due to network attack vector, low attack complexity, no required privileges or user interaction, and high impact on confidentiality, integrity, and availability. Although no exploits are currently reported in the wild, the public disclosure of the vulnerability and its exploitability make it a significant threat. The lack of an official patch at the time of disclosure further elevates risk. The vulnerability affects only firmware version 1.0.0.3, so other versions may not be impacted. The router's HTTP management interface is typically accessible within local networks but may be exposed externally if misconfigured, increasing the attack surface.

The impact of CVE-2026-3272 is substantial for organizations using Tenda F453 routers, especially those with exposed or poorly segmented management interfaces. Successful exploitation can lead to remote code execution, allowing attackers to take full control of the device. This can result in interception or manipulation of network traffic, disruption of network services, and use of the compromised router as a pivot point for lateral movement within the network. Confidentiality is at risk as attackers may capture sensitive data passing through the router. Integrity can be compromised by altering routing or firewall rules, and availability may be affected by causing device crashes or denial of service. For enterprises, this could mean exposure of internal networks, data breaches, and operational downtime. Small businesses and home users are also at risk, particularly if the device is accessible from the internet. The vulnerability’s ease of exploitation and high impact make it a critical concern for network security.

To mitigate CVE-2026-3272, organizations should immediately assess their deployment of Tenda F453 routers and verify the firmware version. If running version 1.0.0.3, they should restrict access to the router’s management interface by implementing network segmentation and firewall rules to limit HTTP access to trusted internal IP addresses only. Disabling remote management over WAN interfaces is strongly recommended to reduce exposure. Monitoring network traffic for unusual HTTP requests targeting /goform/DhcpListClient can help detect exploitation attempts. Until an official patch is released, consider deploying intrusion prevention systems (IPS) with custom signatures to block exploit attempts. If possible, replace affected devices with models from vendors with active security support. Additionally, regularly update router firmware once patches become available and maintain an inventory of network devices to ensure timely vulnerability management. Educate network administrators about the risks of exposed management interfaces and enforce strong authentication and access controls.