Stack-based buffer overflow in the normify function in the rlm_pap module (modules/rlm_pap/rlm_pap.c) in FreeRADIUS 2.x, possibly 2.2.3 and earlier, and 3.x, possibly 3.0.1 and earlier, might allow attackers to cause a denial of service (crash) and possibly execute arbitrary code via a long password hash, as demonstrated by an SSHA hash.
https://bugzilla.redhat.com/show_bug.cgi?id=1066761
http://www.securityfocus.com/bid/65581
http://www.openwall.com/lists/oss-security/2014/02/18/3
http://ubuntu.com/usn/usn-2122-1
http://rhn.redhat.com/errata/RHSA-2015-1287.html
http://lists.freebsd.org/pipermail/freebsd-bugbusters/2014-February/000616.html
http://lists.freebsd.org/pipermail/freebsd-bugbusters/2014-February/000612.html