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.