A critical buffer overflow vulnerability in Tenda CH22 firmware allows remote, authenticated attackers to execute arbitrary code or crash the system.

This vulnerability originates from a buffer overflow in the formdelFileName function located in the /goform/delFileName file. The vulnerability is exploitable remotely by an authenticated user, leading to potential memory corruption or arbitrary code execution.

The exploitation of this vulnerability could lead to a complete compromise of the affected network device, resulting in unauthorized access to internal network traffic or system downtime. Given the CVSS score of 8.8, this flaw represents a high risk to organizational security, as it allows attackers to gain control over infrastructure hardware.

Immediate Action: Since a specific vendor patch is currently unknown, administrators should restrict network access to the management interface of the Tenda CH22 to trusted IP addresses only.

Proactive Monitoring: Monitor device logs for unusual activity related to the /goform/delFileName endpoint and investigate any unexpected system reboots or service instability.

Compensating Controls: Implement strict firewall rules to block external access to the device management interface, ensuring that only authorized internal administrative segments can communicate with the unit.

Public Exploit Available: Yes, a public proof-of-concept exists, as documented in the research write-up at https://github.com/moweizhang1994/cve/issues/2.

Organizations utilizing Tenda CH22 hardware must prioritize the mitigation of this vulnerability by isolating the device from untrusted network segments. While a formal patch remains unavailable, reducing the attack surface via network-level access controls is essential to prevent unauthorized exploitation of this critical memory corruption flaw.