An FR-GV-202 issue in FreeRADIUS 2.x before 2.2.10 allows "Write overflow in rad_coalesce()" - this allows remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code.
https://access.redhat.com/errata/RHSA-2017:1759
http://www.securitytracker.com/id/1038914
http://www.securityfocus.com/bid/99901