They don't really have many services that can be exploited. If it's a HT502, change your default password if WAN access is enabled. Even if someone gets access to it via HTTP, they can't really do much damage to it. If you have another router that you can place behind it, all of the security for your computers would be handled by the second router.
One of the worst things that could happen is that we have to reprovision it if someone removes the provisioning settings.
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