modules/rlmunix/rlmunix.c in FreeRADIUS before 2.2.0, when unix mode is enabled for user authentication, does not properly check the password expiration in /etc/shadow, which allows remote authenticated users to authenticate using an expired password.
freeradius-dialupadmin in freeradius 2.0.4 allows local users to overwrite arbitrary files via a symlink attack on temporary files in (1) backupradacct, (2) cleanradacct, (3) monthlytotstats, (4) totstats, and (5) truncateradacct.