On a recent Nessus scan - received the following as a security hole:

"It is possible to by-pass the rules of the remote firewall
by sending UDP packets with a source port equal to 53."

The device in question is not a firewall, its actually a load balancer.
While its possible it may be a false positive, I'd like to confirm this
all the same, and understand its impact. I ran nmap scans with the
following options:

nmap -g 53 -sU <target>

Is there anyway to confirm this vulnerability? I'm not sure how an
attacker could take advantage of this potential vulnerability?

Insight appreciated,
Thanks.

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