Citrix patches for critical vulnerabilities in its technology have significantly sped up. The first patches are now available for versions 11.1 and 12.0 of Citrix Application Delivery Controller (ADC), formerly known as NetScaler ADC. The company has moved forward its target dates for release of permanent patches for other versions of ADC and older versions of the Citrix SD-WAN WANOP. Hackers have been actively exploiting the flaw in some cases even using it to compromise vulnerable systems and remove malware planted by earlier hackers.”]
Source: https://grahamcluley.com/shitrix-vulnerability-patches/