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Mobile Ad-hoc Networks (MANETs) have gained popularity both in research and in industrial fields. This is due to their ad hoc nature, easy deployment thanks to the lack of fixed infrastructure, self-organization of its components, dynamic topologies and the absence of any central authority for routing. However, MANETs suffer from several vulnerabilities such as battery power, limited memory space, physical protection of network nodes and MANETs are sensitive to various attacks that threaten network security. In this article, we present different known attacks against MANETs and we propose a classification of these attacks following four dimensions: (1) the status of the attacker, (2) the behavior of the attack, (3) the objective of the attacks and (4) the Network layers of the OSI model.