Citrix announced a vulnerability and comprehensive mitigations on December 17 for certain versions of Citrix Application Delivery Controller (ADC), formerly known as NetScaler ADC, and Citrix Gateway. If exploited, if exploited, an unauthenticated attacker could perform arbitrary code execution. This vulnerability also affects certain deployments of two older versions of our Citrix SD-WAN WANOP product versions 10.2.6 and 11.0.3.6. Citrix recommends that customers update to the 12.1 build 50.28/50.31 or later for the mitigation steps to function as intended.”]
Source: https://www.citrix.com/blogs/2020/01/17/citrix-updates-on-citrix-adc-citrix-gateway-vulnerability/