How severe is CVE-2003-0187?

CVE-2003-0187 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2003-0187 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2003-0187?

CVE-2003-0187 affects Linux Linux Kernel. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2003-0187?

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

When was CVE-2003-0187 published?

CVE-2003-0187 was published on 2003-08-27 and last updated on 2026-06-16.

CVE-2003-0187

CVE-2003-0187 is a medium-severity vulnerability in Linux Linux Kernel with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Linux Linux Kernel
Published: 2003-08-27
Last modified: 2026-06-16

Description

The connection tracking core of Netfilter for Linux 2.4.20, with CONFIG_IP_NF_CONNTRACK enabled or the ip_conntrack module loaded, allows remote attackers to cause a denial of service (resource consumption) due to an inconsistency with Linux 2.4.20's support of linked lists, which causes Netfilter to fail to identify connections with an UNCONFIRMED status and use large timeouts.

Frequently asked questions

What is CVE-2003-0187?: The connection tracking core of Netfilter for Linux 2.4.20, with CONFIG_IP_NF_CONNTRACK enabled or the ip_conntrack module loaded, allows remote attackers to cause a denial of service (resource consumption) due to an inconsistency with Linux 2.4.20's support of linked lists, which causes Netfilter to fail to identify connections with an UNCONFIRMED status and use large timeouts.
How severe is CVE-2003-0187?: CVE-2003-0187 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2003-0187 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2003-0187?: CVE-2003-0187 affects Linux Linux Kernel. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2003-0187?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2003-0187 published?: CVE-2003-0187 was published on 2003-08-27 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:o:linux:linux_kernel:2.4.20:*:*:*:*:*:*:*

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