Multiple directory traversal vulnerabilities in FTPServer.py in pyftpdlib before 0.2.0 allow remote authenticated users to access arbitrary files and directories via a .. (dot dot) in a (1) LIST, (2) STOR, or (3) RETR command.
"https://github.com/pypa/advisory-database/blob/main/vulns/pyftpdlib/PYSEC-2010-20.yaml"