A critical buffer overflow vulnerability in the Tenda AC10U router allows authenticated remote attackers to trigger memory corruption, posing a significant risk of system compromise.

The flaw resides in the POST request parameter handler for the /goform/AdvSetLanip endpoint. By manipulating the lanMask argument, an authenticated remote attacker can trigger a buffer overflow, leading to memory corruption.

Successful exploitation of this vulnerability could lead to a complete compromise of the affected network device. Given the CVSS score of 8.8, this poses a high risk to business operations, potentially allowing attackers to disrupt network traffic, gain unauthorized administrative control, or use the device as a pivot point for further lateral movement within the internal network.

Immediate Action: Since no specific patch version is currently identified, administrators should restrict access to the management interface to trusted IP addresses only and monitor for vendor firmware updates.

Proactive Monitoring: Review system logs for unusual POST requests directed at the /goform/AdvSetLanip endpoint and watch for device instability or unexpected reboots.

Compensating Controls: Implement network segmentation to isolate the management interface from the general user network and utilize a Web Application Firewall or firewall rules to block unauthorized access to administrative endpoints.

Public Exploit Available: Yes, a public proof of concept is available via the researcher writeup at the linked Notion repository.

Due to the high severity of this buffer overflow, organizations must prioritize the isolation of affected Tenda AC10U devices. While waiting for official vendor guidance or a firmware patch, ensure that the management interface is not exposed to the public internet and restrict access to authorized administrative staff only to mitigate the risk of unauthorized exploitation.