This article is devoted to optimizing the methodical base for improving adequacy of estimates obtained during analysis of information security risks in modern wireless networks. In this work, a method of accounting for risk dynamics indicators is proposed, based on the model of a generalized attack on an IEEE 802.11 wireless network and experimental data about average duration of implementation of various phases of attacks. Necessary adaptation of tools provided within the framework of fuzzy multiple risk analysis of wireless networks has been performed. Based on the proposed approach, forecasts of changes in risk magnitude were obtained, which ensures additional flexibility in choosing measures to protect a wireless network from economic viability point of view.