Header-based attacks are a form of computer offensive in which the attacker uses its ability to forge arbitrary header data to exploit a flaw in the target’s software that will process this header. This flaw can reside in the code making the processing, but also, more dangerously, in the protocol describing this processing.Although this kind of attack can be used with any level of the protocol stack, the term “Header Attack” is increasingly used to describe application-level attacks, like, for example, HTTP header attacks.