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A mobile ad-hoc network (MANET) can be described as a mobile wireless network, consisting of a collection of communication nodes, which have to interact among themselves without the use of any centralized authority or fixed infrastructure. There are several technical challenges regarding deployment of a MANET, such as network scalability, communication stability, energy consumption, security and quality of services (QoS). Due to vulnerability of wireless links, nodes unstable infrastructure support and highly dynamic network states, MANET security becomes an essential design dimension. initially while designing MANET routing protocols security aspects were not considered, so routing protocols are vulnerable to various types of security attacks such as rushing attack, black hole attack, replay attack, jellyfish attack, wormhole attack, spoofing attack etc. In this paper we have discussed wormhole attack. In this paper, through simulation the effects of wormhole attack on Ad-hoc On Demand Distance Vector Routing (AODV) and Dynamic Source Routing (DSR) protocols have been analyzed and compared.