In a related announcement, the National Security Agency (NSA), FBI, and the Department of Homeland Security's Cyber Security & Infrastructure Security Agency (CISA) today issued a joint advisory warning of the SVR actively targeting widely deployed network and communication technologies on US networks from companies such as Fortinet, Pulse Secure, Citrix, and VMware. The actions mark the first time the US government has formally named a Russian intelligence agency as the perpetrator of the SolarWinds attack and subsequent intrusions into other networks, including those belonging to government agencies, private firms, and security companies such as FireEye and Mimecast. The attacks have caused considerable concern about large-scale data theft, cyber espionage, and threat actors with persistent presence hidden deep on US networks. Previously, US intelligence and law enforcement agencies had described the attacks as being "most likely Russian in origin" but had stopped short of attributing it to any specific entity.