minicom 1.83.1 and earlier allows a local attacker to gain additional privileges via numerous format string attacks.
https://exchange.xforce.ibmcloud.com/vulnerabilities/6498
https://euvd.enisa.europa.eu/vulnerability/EUVD-2001-0562
http://www.securityfocus.com/archive/1/181922
http://www.redhat.com/support/errata/RHSA-2001-067.html
http://www.calderasystems.com/support/security/advisories/CSSA-2001-016.0.txt