This router has documented security problems. Every device on this network — your work laptop, banking app, Ring camera, smart lock — is running at higher risk than it should be.
An F is not a warning — it’s a finding that the router has been independently flagged for security or supply-chain concerns serious enough to warrant action.
-
A real gap that affects every device sharing this Wi-Fi
It affects every device sharing this Wi-Fi — your work laptop, your phone, your kids' devices, your security cameras. Not the most urgent threat on the page, but a real edge an attacker can use to reach the rest.
Show technical detail
DSL era hardware - slow update cadence: DSL gateways are updated less frequently. CenturyLink's patching for older DSL hardware is minimal.
-
Login credentials passing through this router can be captured
Login credentials — including router admin, Wi-Fi, and anything passed through an unencrypted connection — are at risk.
Show technical detail
Default credentials unchanged by most users: Default passwords are printed on the device and rarely changed.
-
CenturyLink can change settings on your router without telling you
Your ISP can access this router remotely to push updates and diagnose issues. This is normal for ISP-owned equipment, but it means there’s another party with admin access to your home network.
Show technical detail
ISP remote access: Standard ISP gateway management.
An A-rated alternative is shown below.
We'll email you if a new vulnerability hits your CenturyLink C4000BG. One email per incident. No spam.