A critical buffer overflow vulnerability in the Tenda F453 router, specifically within the httpd component, poses a significant risk of remote code execution.

This is a stack-based buffer overflow occurring in the formWrlsafeset function of the httpd service. An attacker with low-level privileges can trigger this flaw by sending a crafted HTTP POST request to the /goform/AdvSetWrlsafeset endpoint, where the mit_ssid_index parameter is processed without adequate length validation.

The vulnerability carries a CVSS score of 8.8, reflecting its potential for total system compromise. Successful exploitation allows an attacker to achieve remote code execution, which may lead to full device takeover, interception of network traffic, or persistent denial of service. This represents a severe risk to network integrity and the confidentiality of data transmitted through the affected hardware.

Immediate Action: As there is no official patch currently available, administrators should restrict management access to the device to trusted internal networks only and disable remote administration features.

Proactive Monitoring: Monitor system logs for repeated crashes of the httpd service or unusual traffic patterns directed at the /goform/AdvSetWrlsafeset endpoint.

Compensating Controls: Deploy a Web Application Firewall (WAF) or equivalent network filter to inspect and block POST requests containing excessively long strings in the mit_ssid_index parameter.

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

Given the high severity of this vulnerability and the availability of a public proof-of-concept, immediate action is required to isolate affected devices from external network exposure. Organizations should prioritize removing management interfaces from the public internet and wait for an official firmware update from Tenda to address the underlying memory corruption flaw.