source: http://www.securityfocus.com/bid/41251/info

Mumble Murmur is prone to a denial-of-service vulnerability.

Attackers can exploit this issue to crash the affected application, denying service to legitimate users.

Mumble versions 1.2.2 and prior are vulnerable. 

https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/34228.zip