Late last month Citrix disclosed a critical security hole (CVE-2019-19781) in both its Application Delivery Controller and Unified Gateway (formerly known as Netscaler ADC and Netscaler Gateway) offerings. Up to 80,000 systems were thought to be at risk, with some 25,000 instances found online over the weekend.
Those admins who haven't put mitigations in place by now will want to make sure they address their situation immediately, as infosec researchers have now publicly shared working exploit code for the remote takeover bug. The proof-of-concept code can be used to trivially achieve arbitrary code execution with no account credentials – hijack systems, in other words – via a directory traversal.
Check out the below article for more information and to ensure that you are safe...