The paper proposes a solution to the current problem of ensuring the quality of service of infocommunication networks, taking into account network security, which provides a greater number of services with high efficiency. In the paper, experiments were conducted to analyze the effect of fractality and vulnerabilities on the quality of service parameters. The safety route provision method for the transfer of multifractal traffic in infocommunication networks was proposed. The proposed method takes into account the specified limits on the delay time and the number of lost packets for each type of traffic quality service. The results of the analysis show that the overload during traffic transmission on a switched channel occurs due to the multifractal characteristics of traffic and the presence of an attack. This method is based on a special procedure for calculating the cost of routes with the further use of these data when choosing the shortest paths. In this paper, an experiment was conducted to analyze the effectiveness of the proposed method under conditions of multifractal traffic and the presence of attack traffic. The results showed that the use of the proposed method allows to reduce latency and jitter in the network, as well as to increase the effectiveness of blocking attack traffic.