H3C GR-5400AX routers up to version 100R008 are affected by a buffer overflow vulnerability that enables remote attackers to manipulate parameters and execute unauthorized actions.

This is a buffer overflow vulnerability located in the EditWlanMacList function within the routing/goform/aspForm file. An attacker can exploit this by sending specially crafted parameters, leading to remote code execution.

The CVSS score of 8.8 reflects the high risk associated with this vulnerability, as it allows for remote control of networking hardware. Successful exploitation could lead to total network compromise, data interception, and the potential for a lateral movement pivot point into the internal network.

Immediate Action: Contact H3C support or check the official H3C security advisory portal for the latest firmware release that resolves this buffer overflow.

Proactive Monitoring: Monitor router traffic and administrative access logs for suspicious requests directed at the web management interface.

Compensating Controls: Restrict access to the router's web-based management interface to authorized IP addresses only and disable remote management if not strictly required.

Public Exploit Available: True

Due to the availability of an exploit and the critical function of the router, this vulnerability poses an immediate threat. Administrators must prioritize patching or isolating these devices from the public-facing internet until a firmware update is applied.