Cisco PIX Firewall 515 and 520 with 5.1.4 OS running aaa authentication to a TACACS+ server allows remote attackers to cause a denial of service via a large number of authentication requests.Referenceshttp://www.securityfocus.com/bid/2551https://exchange.xforce.ibmcloud.com/vulnerabilities/6353http://marc.info/?l=bugtraq&m=98658271707833&w=2http://www.cisco.com/warp/public/707/pixfirewall-authen-flood-pub.shtml
