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The Cognitive Radio (CR) is a revolutionary technology which enables access to unused and/or underutilized spectrum efficiently, opportunistically, and dynamically without causing any unacceptable interference to the licensed users. Security in CR Network (CRN) is a major research area which is not yet being explored in large scale. A simple malicious attack can often disrupt the functioning of the CRN, unless proper security mechanisms are incorporated. In this paper, we have illustrated the common threats in CRN emphasising the feature based and layer specific threats. The security features suggested in the IEEE 802.22 WRAN standard has also been discussed. Lastly, we have discussed various aspects and importance of CR security threats in the Vehicular Ad-hoc NETwork (VANET).

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