Provided are a fuzzing system and method of a distributed computing environment (DCE) remote procedure call (RPC) object. The fuzzing system includes a file manager, a random data generator, a RPC packet, and a packet injector. The file manager obtains necessary information by parsing and analyzing an idl file for a target object for fuzzing and a file having information about a Named Pipe file. The random data generator generates a random value using a system clock as a factor. The RPC packet creator embodies protocols used for RPC communication by functions and generating a RPC packet for RPC communication. The packet injector inserts the necessary information and the random value into the generated RPC packet and transmits the generated RPC packet to the target object for fuzzing.