Mobile Ad Hoc Network (MANET) was created as Packet Radio Network (PRNET) in 1970. More than four decades are elapsed to work on it. MANET is open nature scenario that is infrastructure less, in other words, it has no any fixed infrastructure to control and monitor, each node works likes a router. It has dynamic topology, therefore; MANET is easy to create for any task and for any type of network based on applications. It rely on wireless links therefore, wireless links are examined by different researchers and reported various type of security attacks. MANET is easy to be targeted due to open nature. Due to it, facing many issues while major issues like security issues, secure routing issues and so on. To mitigate these issues many researchers and industries have developed and proposed different kind of routing protocols and techniques to detect and prevent the security attacks, it is important to analyze the current development which will give the direction for further development. In this paper, we shall examine in detail different type of attacks that are considered as challenging security issues, secure routing protocols, observed challenges of MANET and finally discuss the open issues of MANET.