CVE-2001-0405 Security feature bypass in n/a

What is CVE-2001-0405?

CVE-2001-0405 is a high-severity vulnerability in Linux kernel, published on 18 Sep 2001. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

ip_conntrack_ftp in the IPTables firewall for Linux 2.4 allows remote attackers to bypass access restrictions for an FTP server via a PORT command that lists an arbitrary IP address and port number, which is added to the RELATED table and allowed by the firewall.

Which versions are affected by CVE-2001-0405?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2001-0405?

No fix has been published for CVE-2001-0405 yet. Limit exposure of the affected software until one is available.

Is CVE-2001-0405 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2001-0405 exists.

Public exploit code: 1 Exploit-DB entry.

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-qphq-fjvj-6855.