Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway before 10.5 Build 53.9 through 55.8 and 10.5.e Build 53-9010.e allow remote attackers to cause a denial of service (reboot) via unspecified vectors.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2015-2917
http://www.securitytracker.com/id/1032242