From itsecuritynews.info
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Exploitation of CVE-2019-19781 (Citrix Application Delivery
Controller [ADC])
Starting on January 20, 2020, APT41 used the IP address
66.42.98[.]220 to attempt exploits of Citrix Application Delivery
Controller (ADC) and Citrix Gateway devices with CVE-2019-19781
(published December 17, 2019).