The National Security Agency issued a new cybersecurity advisory on Thursday, warning that virtual private networks, or VPNs, could be vulnerable to attacks if not properly secured. The agency's warning comes amid a surge in telework as organizations adapt to coronavirus-related office closures and other constraints.

A VPN allows users to establish private, encrypted connections to another network over the internet. They are used widely by corporations and other organizations to protect proprietary data from hackers while employees work remotely.

A senior NSA official who briefed reporters Wednesday said the increase in remote work had attracted the attention of potentially malicious cyber actors. 

Read more: CBS News