A critical buffer overflow vulnerability in Tenda TX3 routers allows remote attackers to compromise device integrity, necessitating immediate attention.

The vulnerability exists in the /goform/SetIpMacBind endpoint, where the application fails to perform length checks on the list parameter before passing it to the strcpy function. This flaw allows a remote authenticated attacker to overflow a stack-based buffer, leading to denial of service or remote code execution.

Successful exploitation of this vulnerability can lead to a complete compromise of the affected router, potentially allowing an attacker to intercept network traffic, redirect users, or pivot into the internal network. Given the CVSS score of 8.8, this represents a high-severity risk that could lead to significant operational disruption and data exposure within environments utilizing these devices.

Immediate Action: Since no official patch is currently identified, administrators should restrict access to the web management interface of the Tenda TX3 to trusted IP addresses only.

Proactive Monitoring: Security teams should monitor network traffic for anomalous POST requests directed at the /goform/SetIpMacBind endpoint and inspect device logs for crash events or unexpected reboots.

Compensating Controls: Deploy a Web Application Firewall or network-level access control list to block unauthorized access to the router management interface, effectively mitigating the remote attack vector.

Public Exploit Available: Yes — a published proof-of-concept exists, attributed to the research write-up by MRAdera.

The presence of a publicly available proof-of-concept increases the likelihood of exploitation by malicious actors. Organizations should prioritize isolating these devices from the public internet and verify if the vendor has released firmware updates, as applying the official patch remains the only definitive method to remediate this memory corruption flaw.