CVE-2003-0187 Denial of service in n/a

What is CVE-2003-0187?

CVE-2003-0187 is a medium-severity denial of service vulnerability in Linux kernel, published on 5 Aug 2003. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Which versions are affected by CVE-2003-0187?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2003-0187?

No fix has been published for CVE-2003-0187 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2003-0187 being exploited?

There is no known exploitation of CVE-2003-0187 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-96rc-4r3g-2j5f.