After the recent Distributed Denial of Service (DDoS) attack on Plex, the company is recommending to the users, an urgent Hotfix to prevent responding request to UDP from outside the Local Network.
The vulnerability on the company servers was fixe and Plex said that it has issued hotfix 66 for Plex Media Server to address the flaw in its product.
Learn more: https://www.techrepublic.com/article/plex-patches-media-server-bug-potentially-exploited-by-ddos-attackers/