A remote stack-based buffer overflow vulnerability in Tenda F451 routers poses a severe risk of arbitrary code execution for authenticated users.

The vulnerability is a stack-based buffer overflow (CWE-121) located in the /goform/qossetting file within the fromqossetting function. An attacker with low-level privileges can trigger this memory corruption by manipulating the qos argument.

This vulnerability carries a CVSS score of 8.8, reflecting its high impact on system integrity, availability, and confidentiality. Successful exploitation allows an attacker to execute arbitrary code or cause a device crash, potentially leading to unauthorized network access, data interception, or a complete denial of service for the managed network environment.

Immediate Action: Since a specific patch version is not currently provided, isolate the affected Tenda F451 devices from external network access until the manufacturer releases a firmware update.

Proactive Monitoring: Monitor device traffic for anomalous HTTP POST requests directed at the /goform/qossetting endpoint, specifically looking for unusually large or malformed payloads in the qos parameter.

Compensating Controls: Implement strict access control lists on the management interface to ensure that only authorized administrative IP addresses can communicate with the router, effectively reducing the attack surface.

Public Exploit Available: Yes, a public proof-of-concept exists via the GitHub issue referenced in the vulnerability report (https://github.com/Jimi-Lab/cve/issues/18).

Given the high severity and the availability of public proof-of-concept code, organizations utilizing Tenda F451 routers should treat this as a high-priority risk. Immediately restrict access to the device management interface to trusted internal networks and monitor vendor support channels for the release of a patched firmware version.