Kerio Personal Firewall (KPF) 2.1.4 has a default rule to accept
incoming packets from DNS (UDP port 53), which allows remote attackers
to bypass the firewall filters via packets with a source port of 53.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
FULLDISC:20030422 UDP bypassing in Kerio Firewall 2.1.4
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