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UDP Source Port Pass Firewall

I have a cisco 837 adsl router. I performed a security scan of my network and the following vulbnerability has been found:

>>>>>>>>

DESCRIPTION:

Your firewall policy seems to allow UDP packets with a specific source port (for example, port 53) to pass through while it blocks UDP packets to the same destination ports but with a random source port.

In the Result section, the service lists up to 16 such destination ports that can be reached by the UDP probes with a source port of 53.

>>>>>>>>>>>

Is there an access list entry I can make to stop this vulnerability?

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