KarjaSoft Sami FTP Server 2.0.x allows remote attackers to cause a denial of service (daemon crash or hang) via certain (1) APPE, (2) CWD, (3) DELE, (4) MKD, (5) RMD, (6) RETR, (7) RNFR, (8) RNTO, (9) SIZE, and (10) STOR commands.