This paper proposes a method to enable a risk-averse and resource-constrained network defender to deploy security countermeasures in an optimal way to prevent multiple potential attackers with uncertain budgets. To solve the problem of information asymmetry between the attacker and the defender, a fake countermeasure (FC) is placed on the arc, and the situation of multiple attackers is also taken into consideration. This method is based on the risk aversion bi-level stochastic network interdiction model on the attack graph, which can easily map the path of attackers. Meanwhile, our method can minimize the weighted sum of all losses and minimize the risk of the defender’s key nodes being destroyed. At the same time, in order to prevent the key node of the defender from being destroyed, the risk condition value measurement is taken into account in the stochastic programming model. We design a SA-CPLEX algorithm to provide a high-quality approximate optimal solution. And computational results suggest that our method provides better network interdiction decisions than traditional deterministic and risk-neutral models.