I have a cisco 837 adsl router. I performed a security scan of my network and the following vulbnerability has been found:
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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.
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Is there an access list entry I can make to stop this vulnerability?
