A critical stack-based buffer overflow vulnerability in Tenda F453 routers allows remote attackers to execute arbitrary code or crash the device.

The device is susceptible to a stack-based buffer overflow in the web management interface, specifically within the fromwebExcptypemanFilter function. By sending a specially crafted HTTP POST request to the /goform/webExcptypemanFilter endpoint, an authenticated attacker can overflow the stack buffer due to a lack of length validation on the page parameter.

Successful exploitation of this vulnerability can result in full device compromise, allowing an attacker to execute arbitrary code with elevated privileges. Given the CVSS score of 8.8, this poses a significant risk to network integrity, potentially enabling unauthorized access to internal traffic, data interception, or the permanent disruption of network services.

Immediate Action: As no official patch is currently confirmed for this specific version, users should restrict access to the device management interface to trusted IP addresses only and disable remote administration features.

Proactive Monitoring: Monitor device logs for unusual HTTP POST requests directed at the /goform/webExcptypemanFilter endpoint and observe for unexpected device reboots or performance degradation.

Compensating Controls: Deploy a Web Application Firewall or network-based intrusion detection system to inspect incoming traffic and block requests containing abnormally long strings in the page parameter.

Public Exploit Available: Yes, a proof-of-concept exploit is available via the researcher's public GitHub repository documenting the vulnerability.

Given the availability of a functional proof-of-concept and the high severity of the potential impact, organizations utilizing Tenda F453 routers must take immediate steps to isolate these devices from external networks. Administrators should prioritize disabling remote management interfaces and closely monitor for unauthorized access attempts until a vendor-supplied firmware update is verified and applied.