CVE-2002-1978: Darren Reed Ipfilter

High severity, CVSS 7.5. EPSS: 2% chance of exploitation in the next 30 days.

IPFilter 3.1.1 through 3.4.28 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.

Affected products

• Darren Reed Ipfilter: version 3.1.1 only; version 3.1.2 only; version 3.1.3 only; version 3.1.4 only; version 3.1.5 only; version 3.1.6 only; …

Published 2002-12-31. Last modified 2026-06-16.