CVE-2004-0432: ProFTPD 1.2.9 treats the Allow and Deny directives for CIDR based ACL entries as if they were AllowAll, which

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HIGH 7.5WATCHLISTDOWNGRADEMITIGATEMITIGATE

CVE-2004-0432 is a high-severity flaw (CVSS 7.5) affecting proftpd, linux, secure linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ProFTPD 1.2.9 treats the Allow and Deny directives for CIDR based ACL entries as if they were AllowAll, which could allow FTP clients to bypass intended access restrictions.

Why this priority

High severity
EPSS top 5%: very likely to be exploited
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	9.2% (top 5%)
CISA exploited list	No
Published	2004-08-18
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: gentoo · proftpd project · trustix

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2004-08-18 04:00 UTCPublished CVE record published
2026-06-16 22:05 UTCUpdated Record last modified

proftpd project proftpd DOWNGRADE

Affected: 1.2.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2.9

1. Check installed version

apt-cache policy proftpd || rpm -q proftpd || proftpd --version

2. No fixed release: DOWNGRADE to a release before 1.2.9 (Debian / Ubuntu)

apt-cache madison proftpd sudo apt install proftpd=<VERSION_BEFORE_1.2.9> sudo apt-mark hold proftpd

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list proftpd sudo dnf downgrade proftpd-<VERSION_BEFORE_1.2.9> sudo dnf versionlock add proftpd

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

gentoo linux MITIGATE

Affected: 0.5 · 0.7 · 1.1a · 1.2 · 1.4 · 1.4 rc1 · 1.4 rc2 · 1.4 rc3

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.5

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

trustix secure linux MITIGATE

Affected: 2.0 · 2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2004-0432?

proftpd: downgrade or apply the listed mitigation; linux: mitigate or apply the listed mitigation; secure linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-0432 being exploited?

CVE-2004-0432 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2004-0432 affect?

CVE-2004-0432 affects proftpd, linux, secure linux. Severity is high (CVSS 7.5). ProFTPD 1.2.9 treats the Allow and Deny directives for CIDR based ACL entries as if they were AllowAll, which could allow FTP clients to bypass intended access restrictions.

How urgent is CVE-2004-0432?

Priority 55/100. High severity; EPSS top 5%: very likely to be exploited; On your watchlist

Software pages

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References

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