Generally speaking, buffer overflows are capable of causing a denial of service because they can result in arbitrary data being loaded into unintended segments of memory. This can disrupt the flow of execution and result in a crash of the service or operating system.The particular script discussed in this recipe works because in the event that the service or operating system did crash, the socket would no longer accept input, and the script would not be able to complete the entire payload series injection sequence. If this occurred, the script would need to be force-closed using Ctrl + C. In such a case, the script would return an indication that subsequent payloads could not be sent and that the server might have crashed.