Cybersecurity experts and officials say VPNFilter has infected an estimated 500,000 devices worldwide.

“The FBI recommends any owner of small office and home office routers reboot the devices to temporarily disrupt the malware and aid the potential identification of infected devices,” the bureau’s cyber division wrote in a public alert.

“Owners are advised to consider disabling remote management settings on devices and secure with strong passwords and encryption when enabled. Network devices should be upgraded to the latest available versions of firmware.”