MANET (Mobile ad-hoc network) is a collection of mobile nodes that communicate over wireless links without having any pre-existing fixed underlying infrastructure. Their dynamically changing topology, lack of central administration and resource constraints makes them prone to security attacks. Quantifying security has always been a difficult task as there is no fixed measure of how secure is secure enough. Moreover, different people have different interpretations for security. In this paper, a security measurement framework for MANETS based on the five parameters CIANA (Confidentiality, Integrity, Authentication, Non-repudiation and Authorization) has been proposed. AHP (Analytic Hierarchy Process) and TOPSIS (Technique for order preference by similarity to Ideal solution) are then applied on the proposed models to select the most secure network amongst a set of heterogeneous networks.