The Dept. of Homeland Security has launched a revamped & improved US-CERT website.  For years this has been a helpful resource in tracking latest major threats & vulnerabilities.  In late 2018, there was a realignment of national cyber-security agencies as documented below to become Cybersecurity and Infrastructure Security Agency (CISA)

https://www.us-cert.gov/

On November 16, 2018, President Trump signed into law the Cybersecurity and Infrastructure Security Agency Act of 2018. This landmark legislation elevated the mission of the former National Protection and Programs Directorate (NPPD) within the Department of Homeland Security (DHS) and established CISA, which includes the National Cybersecurity and Communications Integration Center (NCCIC).   Prior to the establishment of CISA, NCCIC realigned its organizational structure in 2017, integrating like functions previously performed independently by the U.S. Computer Emergency Readiness Team (US-CERT) and the Industrial Control Systems Cyber Emergency Response Team (ICS-CERT).