as executives pointed to weaker-than-expected sales in firewalls. The network security vendor saw its stock price plummet 17.5 percent in after-hours trading Thursday, dropping to $47.51 a share.

Network firewalls protect computer networks against unauthorized use or attack. They permit or deny access to private network devices and applications, and represent an important part of an ...

Cybersecurity firm Fortinet reported Q3 earnings and revenue that topped Wall Street analyst estimates while billings guidance came in below expectations.