WatchGuard SOHO products running firmware 5.1.6 and earlier, and Vclass/RSSA using 3.2 SP1 and earlier, allows remote attackers to bypass firewall rules by sending a PASV command string as the argument of another command to an FTP server, which generates a response that contains the string, causing IPFilter to treat the response as if it were a legitimate PASV command from the server.
AV:N/AC:L/Au:N/C:P/I:P/A:P
This vulnerability has a 1.54% probability of being exploited in the next 30 days, ranking higher than 74% of all scored CVEs.