A critical stack-based buffer overflow in Tenda F453 firmware (version 1.0.0.3) allows remote attackers to execute arbitrary code or cause a denial of service.

The vulnerability is a stack-based buffer overflow (CWE-121) located in the fromVirtualSer function within the /goform/VirtualSer endpoint. By sending a crafted request with an excessively long page parameter, an authenticated attacker can overwrite stack memory, leading to remote code execution or system instability.

The exploitation of this vulnerability poses a severe risk to business operations, as it allows for unauthorized remote code execution on the affected network device. Given the CVSS score of 8.8, this flaw represents a high-severity threat that could lead to full device compromise, potential lateral movement within the network, or complete loss of availability for the affected hardware.

Immediate Action: Since a specific patch is not currently available, administrators should restrict network access to the administrative interface of the Tenda F453 device.

Proactive Monitoring: Monitor device logs for anomalous POST requests directed at the /goform/VirtualSer endpoint that contain unusually long string values in the page parameter.

Compensating Controls: Implement access control lists or firewall rules to limit access to the device management interface to trusted internal IP addresses only.

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

Due to the critical nature of this buffer overflow and the availability of a public proof-of-concept, users are urged to mitigate this risk immediately. Restrict management access to the device to prevent remote exploitation and monitor vendor channels for the release of an official firmware update to address this vulnerability.