CVE-2001-1387: Netfilter Iptables

Low severity, CVSS 2.1. EPSS: 0.4% chance of exploitation in the next 30 days.

iptables-save in iptables before 1.2.4 records the "--reject-with icmp-host-prohibited" rule as "--reject-with tcp-reset," which causes iptables to generate different responses than specified by the administrator, possibly leading to an information leak.

Affected products

• Netfilter Iptables: before 1.2.4 (fixed in 1.2.4)

Published 2001-11-05. Last modified 2026-06-16.