This router gets the basics right, but the gaps are significant. The Arris hardware platform has documented vulnerabilities. If any device on your Wi-Fi gets infected — a kid’s tablet, a smart bulb, a guest’s phone — it can reach your work laptop and banking app on the same flat network.
A C grade is not a sign-off. It means there are real, exploitable issues affecting this network every day.
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This device just hands traffic to the router behind it — your protection depends entirely on that router
This device just hands traffic to the router behind it — so the router's grade decides what protects your work laptop, banking app, security cameras, and smart speakers. If that router is weak, this modem provides no fallback.
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Arris platform CVE history: The Arris hardware platform has documented vulnerabilities. The MB8611 is a cable modem, so the attack surface is narrower than a full router, but firmware security still matters.
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This device just hands traffic to the router behind it — your protection depends entirely on that router
This device just hands traffic to the router behind it — so the router's grade decides what protects your work laptop, banking app, security cameras, and smart speakers. If that router is weak, this modem provides no fallback.
Show technical detail
No security features - router dependent: This is a cable modem only. All security - firewall, VPN, device filtering - depends entirely on the router connected to it. Check your router's rating separately.
If a new vulnerability is found for your Motorola MB8611, we'll email you. One email per incident. No spam.