CVE-2001-0405

highpriority · track · 44EPSS 0.103 · 96 %ileexploit · functionalEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · functional

Likely / severe?

10.3% (96th) EPSS

CVSS 7.5 · high

Is it mine?

7 products

Check your exposure

Who says so?

4 sources

enisa_euvd · fstec_bdu · nvd · redhat_csaf

EPSS · scored 2026-10-27

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedRed Hat Linux 7.1redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. The procedure for upgrading the kernel is documented at: http://www.redhat.com/support/docs/howto/kernel-upgrade/kernel-upgrade.html Please read the directions for your architecture carefully before proceeding with the kernel upgrade. Please note that this update is also available via Red Hat Network. Many people find this an easier way to apply updates. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system.
https://access.redhat.com/errata/RHSA-2001:084

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.8–7.5

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Psecondary · FSTEC (BDU) RU

v2.06.8mediumAV:N/AC:L/Au:N/C:P/I:P/A:P/E:POCsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-264USLLM-inferredCWE-284USLLM-inferred

exploits (1)

Public proof-of-concept and weaponised exploit code.

EDB-20765Linux Kernel 2.4 - IPTables FTP Stateful Inspection Arbitrary Filter Rule Insertionfunctional · exploit_db

affected products (7)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
Red Hat Inc. Red Hat Enterprise Linux≤ 7.1fstec_bduRU
linux linux kernel= 2.4.0nvdUScpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux kernel= 2.4.1nvdUScpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux kernel= 2.4.2nvdUScpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux kernel= 2.4.3nvdUScpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Red Hat Linux 7.1all versionsfixedredhat_csafUScpe:/o:redhat:linux:7.1

advisories (1)

Vendor and ecosystem advisories describing this.

RHSA-2001:084Red Hat Security Advisory: Kernel2001-06-22csaf · redhat_csafUS
A security hole has been found that does not affect the default configuration of Red Hat Linux, but it can affect some custom configurations of Red Hat Linux 7.1. The bug is specific to the Linux 2.4 kernel series. Aside from the fix, countless bugfixes have been applied to this kernel as a result of code-audits by the MC project of the Stanford University and others.

also known as (11)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

enisa_euvd fstec_bdu nvd redhat_csaf NVD CVE.org MITRE

published 2001-07-02modified 2026-06-16

references (12)

External citations — patches, advisories, analysis.

scry

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