A buffer overflow vulnerability in Tenda F456 firmware version 1.0.0.5 poses a critical risk of remote code execution for authenticated users.

This is a stack-based buffer overflow flaw located in the fromRouteStatic function within the /goform/RouteStatic endpoint. The vulnerability is triggered when the application fails to perform length validation on the user-provided page parameter, allowing an authenticated attacker to corrupt memory and potentially execute arbitrary code.

Successful exploitation of this vulnerability allows an attacker to achieve remote code execution, which could lead to full device compromise and unauthorized access to network traffic. Given the CVSS score of 8.8, the potential for significant disruption to business operations and the loss of data confidentiality is high. The ability to execute arbitrary code on network infrastructure devices creates a severe risk of persistent unauthorized access within the local environment.

Immediate Action: Contact the vendor for an official security patch or firmware update, as there is currently no publicly confirmed fix available for version 1.0.0.5.

Proactive Monitoring: Monitor network traffic for anomalous HTTP POST requests directed toward the /goform/RouteStatic endpoint, particularly those containing unusually long string inputs in the page parameter.

Compensating Controls: Implement access control lists on the management interface to restrict access to trusted administrative IP addresses only, and deploy a Web Application Firewall or intrusion prevention system to detect and block oversized HTTP payloads.

Public Exploit Available: Yes, a published proof-of-concept exists, as documented in the technical write-up provided in the research references.

Given the severity of this remote code execution vulnerability and the availability of a public proof-of-concept, users of the Tenda F456 device should prioritize securing their hardware. Until an official patch is released, administrators must isolate the device from external network exposure and restrict access to the web management interface to mitigate the risk of exploitation.