If you are using Citrix ADC and/or Citrix Gateway and/or Citrix SD-WAN WANOP, it is better to check your system if any vulnerability exists.
It is a system that optimizes performance of services and applications using some compression and cahing methods.
It is an infrastructure that creates one url for accessing all the applications via different devices remotely in a secure way.
It is a solution for controlling the network traffic, increasing application performance in a centalized and secure way.
There is an issue reported that attacker can perform arbitrary code execution if the vulnerability exploited.
Update your Citrix Gateway and ADC to the latest version.