An attacker manipulates a data buffer to change the execution flow of a process to a sequence of events the attacker controls. Data buffers in software applications provide a storage-space for external input. Buffer attacks provide input the buffer cannot correctly handle. Buffer attacks are distinguished in that it is the buffer space itself that is the target of the attack rather than any code responsible for interpreting the content of the buffer. In virtually all buffer attacks the content that is placed in the buffer by the user is immaterial. Instead, most buffer attacks involve providing more input than the buffer can store, resulting in the overwriting of other program memory or even the program stack with user supplied input.