During the last two decades, the world had witnessed a revolution in information and communication technology, the effects of which extended to the battlefields, whose space extended to include virtual reality. Furthermore, the most modern weapons systems depend on cyber infrastructure, including computer systems and the Internet, which became the hallmark of contemporary conflicts. Since International Humanitarian Law (IHL) treaties were drafted at a time when cyber-attacks were just science fiction, the question raised by this research is whether IHL responds to the challenges posed by modern technological development? In other words, is international humanitarian law - in its current state - applicable to cyber-attacks, or is there a need to adapt some of its rules to cope with modern technological developments? This research initially clarifies the type of cyber-attacks, which falls under the jurisdiction of IHL, and then moves on to examine the applicability of IHL to cyber-attacks from two angles, the first: in terms of the use of cyber weapons as a means of cyber-attack, through exposure to the extent to which the usage of these weapons complies with the rules regulating the acquisition of new weapons, and the second: in terms of the use of cyber-attacks as a method of combat, by examining the applicability of the rules regulating the legality of attacks on them.