What’s Vulnerable › Vulnerabilities

CVE-2001-1387

• Severity: low (CVSS 2.1 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2001-11-05 · updated 2026-06-16
• Weakness: CWE-203

Description

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

How to fix

Upgrade to a fixed version: Netfilter Iptables 1.2.4. Check the vendor advisory for mitigations.

References

• http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=50500
• http://rhn.redhat.com/errata/RHSA-2001-144.html
• http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=50500
• http://rhn.redhat.com/errata/RHSA-2001-144.html

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