Many efforts have been made to develop security solutions for MANETs. These networks are vulnerable to diverse types of attacks, where routing is a critical operation. Current secure routing protocols are based on preventive or reactive security mechanisms, monitoring node behavior or controlling the access to networks and information. These mechanisms are insufficient to put all attacks and intrusions off, motivating the use of techniques that can tolerate them as multipath routing. This work proposes a new scheme based on fuzzy logic to select better paths and to increase network survivability. Our approach considers different selection criteria, where some of them represent network status and others are issued by preventive, reactive and tolerant defense lines. Simulations have been carried out comparing AODV and AOMDV with a modified AOMDV protocol. Results show the survivability of our approach under different conditions.