Linksys X3000 is vulnerable to an OS command injection vulnerability. The vulnerability is caused by missing input validation in the ping_ip parameter and can be exploited to inject and execute arbitrary shell commands. You need to be authenticated to the device or you have to find other methods for inserting the malicious commands.
https://thehackernews.com/2025/01/hackers-exploit-zero-day-in-cnpilot.html
https://thehackernews.com/2025/01/mirai-botnet-variant-exploits-four.html
https://securityaffairs.com/172805/malware/gayfemboy-mirai-botnet-four-faith-flaw.html
https://blog.xlab.qianxin.com/gayfemboy/