A critical stack-based buffer overflow in the Tenda F453 router, version 1.0.0.3, allows remote attackers to achieve remote code execution or cause a denial of service.

The vulnerability is a stack-based buffer overflow occurring within the httpd component, specifically in the fromRouteStatic function. An authenticated attacker can trigger the overflow by sending a crafted HTTP POST request to the /goform/RouteStatic endpoint with an excessively long page parameter.

The ability to execute arbitrary code remotely on network infrastructure poses a severe threat to internal network security. A successful exploit could lead to full device compromise, allowing attackers to intercept traffic, pivot into private network segments, or permanently disrupt critical connectivity. With a CVSS score of 8.8, this vulnerability represents a high-risk security flaw that requires immediate attention to prevent unauthorized access and potential data exfiltration.

Immediate Action: Since no official patch is currently available, administrators should restrict access to the device management interface to trusted administrative IP addresses only.

Proactive Monitoring: Monitor network traffic for unusual HTTP POST requests targeting the /goform/RouteStatic URI, particularly those containing abnormally long strings in the page parameter.

Compensating Controls: Deploy a Web Application Firewall or network-based intrusion detection system to filter or block malformed POST requests directed at the vulnerable endpoint.

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

Given the availability of a public proof-of-concept and the potential for remote code execution, this vulnerability poses a significant risk to affected Tenda F453 deployments. Organizations should prioritize isolating these devices from the public internet and implement strict access controls until a vendor-supplied firmware update addressing the memory corruption flaw is released. Failure to mitigate this risk could provide attackers with a foothold for deeper network penetration.