An exploitable denial-of-service vulnerability exists in the way CoTURN 4.5.1.1 web server parses POST requests. A specially crafted HTTP POST request can lead to server crash and denial of service. An attacker needs to send an HTTP request to trigger this vulnerability.
https://www.debian.org/security/2020/dsa-4711
https://usn.ubuntu.com/4415-1/
https://talosintelligence.com/vulnerability_reports/TALOS-2020-0985