CNA said it had restored email function and implemented new security measures.

Two Eastern European criminal groups began targeting hypervisors in 2020, according to CrowdStrike.

Fundamental questions, like how the SolarWinds hackers got into its systems from the start, still aren't answered.

The discovery adds to the public understanding of one of the most complex digital espionage operations in recent memory.

Another major cybersecurity company finds itself responding to the year's biggest challenge.

The cybersecurity community and Capitol Hill are watching closely.