The nation’s top cybersecurity agencies, the Federal Bureau of Investigation (FBI) and the Cybersecurity and Infrastructure Security Agency (CISA), released a joint Cybersecurity Advisory on Wednesday regarding the hack of the Microsoft Exchange Server, calling on potential victims and users to install patches and verify any unauthorized executions of some functions. “Continual use of unpatched exchange servers or delayed implementation of Microsoft-released updates poses a serious risk to affected systems,” the advisory warned. It recommended installing all the security patches that Microsoft released on March 2. On March 3, Microsoft announced that they had observed “multiple zero-day exploits being used to attack on-premises versions of Microsoft Exchange Server in limited and targeted attacks.” A “zero-day exploit” means a hacker exploits a software or hardware flaw before the developer is aware of the flaw. Microsoft said that the operation was carried out by a Chinese “state-sponsored” group nicknamed “Hafnium,” running outside of China. …