Ipswitch WhatsUp Professional 2006 only verifies the user's identity via HTTP headers, which allows remote attackers to spoof being a trusted console and bypass authentication by setting HTTP User-Agent header to "Ipswitch/1.0" and the User-Application header to "NmConsole".
https://exchange.xforce.ibmcloud.com/vulnerabilities/26529
http://www.vupen.com/english/advisories/2006/1849
http://www.securityfocus.com/bid/18019
http://www.securityfocus.com/archive/1/434447/100/0/threaded
http://www.securityfocus.com/archive/1/434247/100/0/threaded