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Security of wireless sensor network (WSN) remained an open research area throughout the current decade. New research and developments seems protecting sensor networks from various security threats but at the same time raise many questions, confusions and conflicts regarding their own viability. Such viability issues become major hindrances in security assessment of WSNs against posed security threats. This results in less reliable sensor networks and applications. In our strong opinion, there are two root-causes of this problem; 1) a comprehensive list of security threats is overlooked as researchers' work appear limited in classification of security threats and, 2) security threats are not associated with security frameworks. In this paper, we perform classification of security threats comprehensively whereas, associating these threats to a security framework; we lead in this direction. We find that specifically to assess the impact of these threats.