CSGO Crash exploit?

Zeddy_god · **Author**

Hey guys, someone has been trying to crash/lag my server , its freezing every few seconds

Msg from 176.205.86.100:27005: CCLCMsg_VoiceData rejected by msg bind (89 bytes)
Msg from 49.147.197.61:20183: CCLCMsg_VoiceData rejected by msg bind (88 bytes)
Msg from 176.205.86.100:27005: CCLCMsg_VoiceData rejected by msg bind (89 bytes)
Msg from 49.147.197.61:20183: CCLCMsg_VoiceData rejected by msg bind (88 bytes)
Msg from 176.205.86.100:27005: CCLCMsg_VoiceData rejected by msg bind (155 bytes)

I'm already using null wave fix, tried every version of it.

Is this a new exploit? Someone know a fix?

Also , might be unrelated but I did get this spam as well

[NET] Cannot send 1209-byte packet to 36.71.234.144

4838. MTU is 1200. ff ff ff ff 44
[NET] Cannot send 1209-byte packet to 36.71.234.144:12153. MTU is 1200. ff ff ff ff 44
[NET] Cannot send 1209-byte packet to 36.71.234.144:48131. MTU is 1200. ff ff ff ff 44
[NET] Cannot send 1209-byte packet to 36.71.234.144:22812. MTU is 1200. ff ff ff ff 44
[NET] Cannot send 1209-byte packet to 36.71.234.144:49675. MTU is 1200. ff ff ff ff 44
[NET] Cannot send 1209-byte packet to 36.71.234.144:21469. MTU is 1200. ff ff ff ff 44
[NET] Cannot send 1209-byte packet to 36.71.234.144:1549. MTU is 1200. ff ff ff ff 44
[NET] Cannot send 1209-byte packet to 36.71.234.144:6574. MTU is 1200. ff ff ff ff 44
[NET] Cannot send 1209-byte packet to 36.71.234.144:54630. MTU is 1200. ff ff ff ff 44
[NET] Cannot send 1209-byte packet to 36.71.234.144:46870. MTU is 1200. ff ff ff ff 44

[My provider confirmed there is no ddos attack so that's out of question]

asdfxD · 05-08-2019 , 00:06 Re: CSGO Crash exploit?

Msg from 176.205.86.100:27005: CCLCMsg_VoiceData rejected by msg bind (89 bytes)
Msg from 49.147.197.61:20183: CCLCMsg_VoiceData rejected by msg bind (88 bytes)
Msg from 176.205.86.100:27005: CCLCMsg_VoiceData rejected by msg bind (89 bytes)
Msg from 49.147.197.61:20183: CCLCMsg_VoiceData rejected by msg bind (88 bytes)
Msg from 176.205.86.100:27005: CCLCMsg_VoiceData rejected by msg bind (155 bytes)

that does not crash the server, i got them as well sometimes.

[NET] Cannot send 1209-byte packet to 36.71.234.1444838. MTU is 1200. ff ff ff ff 44

change your mtu? default mtu is usally/mostly 1500

Zeddy_god · 05-08-2019 , 02:51 Re: CSGO Crash exploit?

Msg from 110.138.148.242:49271: CCLCMsg_VoiceData rejected by msg bind (88 bytes)
Msg from 110.138.148.242:49271: CCLCMsg_VoiceData rejected by msg bind (154 bytes)
Msg from 110.138.148.242:49271: CCLCMsg_VoiceData rejected by msg bind (88 bytes)
Msg from 110.138.148.242:49271: CCLCMsg_VoiceData rejected by msg bind (88 bytes)
Msg from 110.138.148.242:49271: CCLCMsg_VoiceData rejected by msg bind (154 bytes)

This causes my server to freeze and lag for a few seconds, its definitely an exploit.

Is there any fix?

backwards · 05-08-2019 , 03:34 Re: CSGO Crash exploit?

Those messages are a symptom of a lag spike on your server, but not the cause. This happens when clients are using voice chat while the server lags and can't processes the voice messages. They build up in the queue so when the server does respond again, it overflows how many messages it can read within that given time and spews these messages.