A cable connector assembly (100) includes an electrical connector (1), a cable connecting the electrical connector electrically, an external shell (2) mounted to the connecting portion of the electrical connector and the cable. The electrical connector includes an insulative housing (12), a number of terminals (13) received in the insulative housing, and a front shell (11) mounted to the insulative housing. The insulative housing includes a base section (120) and a mating section (123) extending forwardly from the base section. The front shell (11) includes a frame portion (113) enclosing the mating section and a retaining portion (110) extending rearwardly from the frame portion and assembled to the base section. The retaining portion further defines a number of elastic portions (111) bent upwardly from the retaining portion and resisting against an inner face of the external shell.