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As an emerging fast-growing technology, smart grid networks (SGNs) have been dramatically accepted by the current power supply industry for achieving high performance power governance system. The wireless SGN (WSGNs) have enabled numerous flexible power management solutions without the restrictions of the wired infrastructure. The cognitive radio network (CRN) is one of the widely deployed wireless networking approaches. The communication security is a major concern while CRN is used in WSGNs. Currently, jamming and spoofing are two common attack approaches that are active in the deployment of WSGNs when using CRNs. This paper proposes an attack strategy, maximum attacking strategy using spoofing and jamming (MASS-SJ), which utilizes an optimal power distribution to maximize the adversarial effects. Spoofing and jamming attacks are launched in a dynamic manner in order to interfere with the maximum number of signal channels. Our proposed approach has been evaluated by our experiments and the results have shown the positive performance of using MAS-SJ.