The issue is related to implementations of UDP application protocols being vulnerable to network loops. An unauthenticated attacker can use maliciously-crafted packets against a vulnerable implementation, leading to Denial of Service (DOS) and/or abuse of resources. The vulnerability is associated with the possibility of spoofing attacks. It is estimated that up to 300,000 hosts are at risk, and over 517,000 results have been found. The vulnerability can be exploited by sending UDP packets with spoofed source IP and port using another Webmin instance's IP address, leading to endless traffic exchange between hosts.