TippingPoint IPS before 20070710 does not properly handle a hex-encoded alternate Unicode '/' (slash) character, which might allow remote attackers to send certain network traffic and avoid detection, as demonstrated by a cmd.exe attack.
https://exchange.xforce.ibmcloud.com/vulnerabilities/35336
http://www.vupen.com/english/advisories/2007/2490
http://www.securitytracker.com/id?1018361
http://www.securityfocus.com/archive/1/473311/100/0/threaded
http://www.3com.com/securityalert/alerts/3COM-07-003.html
http://secunia.com/advisories/26013
http://lists.grok.org.uk/pipermail/full-disclosure/2007-July/064550.html