This paper presents a brief overview on WSN (wireless sensor network) network architecture and also it presents a detailed discussion on various security goals related to sensor nodes in WSN network such as Data confidentiality, Data integrity, Availability, Authentication, Data freshness, Time Synchronization etc. Numbers of hazardous attacks that can occur in a WSN network are presented in this paper for which solutions can be designed in order to improve the services of such networks. Such malicious attacks are as follows: Spoofed, altered, or replayed information, Selective forwarding, Sinkhole attack, Sybil Attack, HELLO flood attack, Wormholes Attack.
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