The FBI’s Cyber Division leads the nation’s efforts to investigate and prosecute internet crimes. (Source: FBI)

Threat actors have gained access to government networks through a combination of Windows and VPN bugs, a commonly used tactic known as vulnerability chaining in which multiple bugs are used in a single intrusion to compromise a network or application.

The recent malicious activity took aim at federal and state, local, tribal and territorial government networks, according to a joint statement last Friday by CISA and the FBI.

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