This is one of the better routers on the market — and it still has gaps that matter. A path traversal vulnerability let attackers access the admin panel without authentication. Without router-level VPN or strict network segmentation, your work laptop, banking sessions, security cameras, and any infected smart device all share the same flat network.
A B grade is a relative ranking in a market where the floor is low. The gaps are real, they just aren’t urgent.
-
Anyone connected to your Wi-Fi can change router settings without the admin password
Anyone connected to your Wi-Fi, including guests or compromised devices, could change router settings without knowing the admin password.
Show technical detail
Authentication bypass - slow patch: A path traversal vulnerability let attackers access the admin panel without authentication. Verizon patched it but deployment to customers was slow.
-
Verizon 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 for ISP gateways: Verizon can remotely access this device.
-
A small gap that still touches every device on this network
A small gap, not an urgent one — but it still touches everything on this network: your work laptop, your phone, your security cameras, and any guest device that joins the Wi-Fi.
Show technical detail
Simplified firewall: The G3100's firewall is simplified for consumers. Granular rules are not available.
If a new vulnerability is found for your Verizon Fios G3100, we'll email you. One email per incident. No spam.
- CVE-2021-20090 · CVSS 9.8 · 2021 ↗
- Verizon Terms of Service ↗
- FCC Equipment Authorization Database ↗