GHSA-HW4G-FHCP-X5MQ Concurrent Execution using Shared Resource with Improper Synchronization in pyftpdlib

Race condition in the FTPHandler class in ftpserver.py in pyftpdlib before 0.5.2 allows remote attackers to cause a denial of service daemon outage by establishing and then immediately closing a TCP connection, leading to the accept function having an unexpected value of None for the address, or ...