CVE-2001-0405: Linux Kernel

High severity, CVSS 7.5. EPSS: 10.3% chance of exploitation in the next 30 days.

ip_conntrack_ftp in the IPTables firewall for Linux 2.4 allows remote attackers to bypass access restrictions for an FTP server via a PORT command that lists an arbitrary IP address and port number, which is added to the RELATED table and allowed by the firewall.

Affected products

• Linux Linux Kernel: version 2.4.0 only; version 2.4.1 only; version 2.4.2 only; version 2.4.3 only

Published 2001-07-02. Last modified 2026-06-16.