Researchers have disclosed the details of two unpatched vulnerabilities that expose more than one million home routers made by South Korea-based Dasan Networks to remote hacker attacks.

In a blog post published on Monday, vpnMentor revealed that many Gigabit-capable Passive Optical Network (GPON) routers, which are used to provide fiber-optic Internet, are affected by critical vulnerabilities. The company told SecurityWeek that the impacted devices are made by Dasan Networks.