The web management interface in Citrix NetScaler 8.0 build 47.8 uses weak encryption (XOR of unpadded data) to store credentials within a cookie, which makes it easier for remote attackers to obtain cleartext credentials when a cookie is captured via a known-plaintext attack.
https://exchange.xforce.ibmcloud.com/vulnerabilities/38646
http://www.securityfocus.com/archive/1/484182/100/0/threaded