source: https://www.securityfocus.com/bid/42026/info

KVIrc is prone to a remote command-execution vulnerability because the application fails to sufficiently sanitize user-supplied input.

Exploiting this issue can allow an attacker to execute arbitrary commands within the context of the affected application.

KVIrc 4.0.0 is vulnerable; other versions may also be affected. 

/ctcp nickname DCC GET\rQUIT\r
/ctcp nickname DCC GET\rPRIVMSG\40#channel\40:epic\40fail\r