The ABB Cylon FLXeon BACnet controller is vulnerable to an unauthenticated WebSocket implementation that allows an attacker to execute the tcpdump command. By exploiting this vulnerability, an attacker can launch multiple instances of tcpdump, leading to resource exhaustion, denial of service (DoS) conditions, and potential data exfiltration. The lack of authentication on the WebSocket interface enables unauthorized users to continuously spawn new tcpdump processes, escalating the impact of the attack.