The Authentication, Authorization, and Accounting (AAA) capability in versions 5.0(1) and 5.0(3) of the software used by multiple Cisco Anomaly Detection and Mitigation products, when running with an incomplete TACACS+ configuration without a "tacacs-server host" command, allows remote attackers to bypass authentication and gain privileges, aka Bug ID CSCsd21455.
https://exchange.xforce.ibmcloud.com/vulnerabilities/24689
http://www.vupen.com/english/advisories/2006/0612
http://www.securityfocus.com/bid/16661
http://www.cisco.com/en/US/products/products_security_advisory09186a008060519a.shtml
http://securitytracker.com/id?1015638
http://securitytracker.com/id?1015637