modules/rlm_unix/rlm_unix.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.

The rad_decode function in FreeRADIUS before 1.1.8 allows remote attackers to cause a denial of service (radiusd crash) via zero-length Tunnel-Password attributes, as demonstrated by a certain module in VulnDisco Pack Professional 7.6 through 8.11. NOTE: this is a regression error related to CVE-2003-0967.

Unspecified vulnerability in FreeRADIUS 1.0.0 up to 1.1.0 allows remote attackers to bypass authentication or cause a denial of service (server crash) via "Insufficient input validation" in the EAP-MSCHAPv2 state machine module.

Buffer overflow in the sql_escape_func function in the SQL module for FreeRADIUS 1.0.2 and earlier allows remote attackers to cause a denial of service (crash).

SQL injection vulnerability in the radius_xlat function in the SQL module for FreeRADIUS 1.0.2 and earlier allows remote authenticated users to execute arbitrary SQL commands via (1) group_membership_query, (2) simul_count_query, or (3) simul_verify_query configuration entries.