The IPv6 Unicast Reverse Path Forwarding (RPF) implementation on the SEIL/X1, SEIL/X2, and SEIL/B1 routers with firmware 1.00 through 2.73, when strict mode is used, does not properly drop packets, which might allow remote attackers to bypass intended access restrictions via a spoofed IP address.
https://exchange.xforce.ibmcloud.com/vulnerabilities/61382
http://www.seil.jp/seilseries/security/2010/a00875.php
http://secunia.com/advisories/41088