"Kermit the frog" crashing servers?

[punishme]

I hope this is the right section to post this.

So basically I host a sandbox server and today around 21:51:19 GMT+1 a guy called "Kermit the Frog" connected to my server.
Right when he began downloading our server files a player recognized him. This is what I got from the ULX Logs.

[21:51:19] Client "Kermit the Frog" connected.
[21:51:23] xirionz934: Oh no
[21:51:25] The G Man was killed by pill_ent_phys
[21:51:25] xirionz934: It's kermit
[21:51:31] xirionz934: He shuts down games
[21:52:08] xirionz934: really

Right after he spawned he started using wire and he typed !exploit and at that point the server crashed and it took our "Server Watcher"
5 minutes to restart it. This is what we got out of our ulx log.

[21:53:59] Client "Kermit the Frog" spawned in server <STEAM_0:1:43607376> (took 160 seconds).
[21:54:07] The G Man: NOOOOOOOOOOOOOOOOOOOOOOOOOOO D:
[21:54:20] xirionz934: woah
[21:54:32] xirionz934: I'll see you later tomorrow
[21:54:33] xirionz934: Ok?
[21:54:38] The G Man killed xirionz934 using player
[21:54:40] xirionz934: I'll add you tomorrow
[21:54:41] Kermit the Frog<STEAM_0:1:43607376> used the tool wire_expression2 on maps/gm_flatgrass.bsp
[21:54:44] Kermit the Frog<STEAM_0:1:43607376> used the tool wire_expression2 on maps/gm_flatgrass.bsp
[21:54:45] xirionz934: On Steam
[21:54:47] Kermit the Frog<STEAM_0:1:43607376> spawned ragdoll models/police.mdl
[21:54:49] Kermit the Frog<STEAM_0:1:43607376> used the tool wire_expression2 on models/police.mdl
[21:54:54] The G Man: :D YESSSSSSSSS :DDD
[21:54:58] Kermit the Frog: !exploit
>>>>> 5 Minute crash <<<<<<
[22:00:45] New map: gm_carconstruct_b1_8

Any idea how he managed to do this? And can we prevent this from happening again?

[elix]

What addons are you using? Because I bet one of them has exploits hidden in it.

[punishme]

We actually use the usual addons. Here's a link which leads to our collection

[url]http://steamcommunity.com/sharedfiles/filedetails/?id=246483673[/url]

[editline]8th August 2014[/editline]

Oh and look I just found his ask.com he had a link on his steam page.

[url]http://ask.fm/theplayer232[/url]

[Rubat]

E2 may allow numerous crash exploits, like spawning props and making their physics flip out by applying extreme forces to it, etc.