Former C.I.A. chiefs should routinely have their security clearances revoked. They tend to be sloppy with classified data and sometimes leakers or political plotters. The only C.I.A. Chief that needs top secret clearance is the one presently on the job.
Generally it seems very shoddy practice to allow anyone not working presently for the government to have a security clearance. Spook security doesn’t have the resources to keep an eye on all of them. They may even be clandestine agents of the Clinton Foundation.