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While observing traffic sent to the “cli.cgi” file, I found it was possible to inject arbitrary JavaScript into the router's web interface via the "echo" command. The below URL functions as a proof of concept.
If the above URL was loaded by a logged in user, either through a phishing attack, or some other vector, a threat actor could execute arbitrary JavaScript in the user's browser, This could allow for potentially unauthorized changes.
To remediate this, input echoed back to the user should be escaped.