How severe is CVE-2001-1387?

CVE-2001-1387 has a CVSS 2.0 base score of 2.1, rated low severity.

Is CVE-2001-1387 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2001-1387?

CVE-2001-1387 affects Netfilter Iptables. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2001-1387?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2001-1387 published?

CVE-2001-1387 was published on 2001-11-05 and last updated on 2026-06-16.

CVE-2001-1387

CVE-2001-1387 is a low-severity vulnerability in Netfilter Iptables with a CVSS 2.0 base score of 2.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-203.

Key facts

Severity: Low (CVSS 2.0 base score 2.1)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-203
Affected product: Netfilter Iptables
Published: 2001-11-05
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2001-1387?: 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.
How severe is CVE-2001-1387?: CVE-2001-1387 has a CVSS 2.0 base score of 2.1, rated low severity.
Is CVE-2001-1387 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2001-1387?: CVE-2001-1387 affects Netfilter Iptables. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2001-1387?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2001-1387 published?: CVE-2001-1387 was published on 2001-11-05 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:netfilter:iptables:*:*:*:*:*:*:*:*

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