CVE-2005-4673: ioFTPD 0.5.84 u responds with different messages depending on whether or not a username exists, which allows r

Routine

MEDIUM 5.0DOWNGRADE

CVE-2005-4673 is a medium-severity flaw (CVSS 5.0) affecting ioftpd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ioFTPD 0.5.84 u responds with different messages depending on whether or not a username exists, which allows remote attackers to enumerate valid usernames.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Published	2005-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: inicom networks

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

Am I affected?

Timeline

2005-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:19 UTCUpdated Record last modified

inicom networks ioftpd DOWNGRADE

Affected: 5.8.4u

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.8.4u

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.8.4u (Debian / Ubuntu)

apt-cache madison ioftpd sudo apt install ioftpd=<VERSION_BEFORE_5.8.4u> sudo apt-mark hold ioftpd

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

dnf --showduplicates list ioftpd sudo dnf downgrade ioftpd-<VERSION_BEFORE_5.8.4u> sudo dnf versionlock add ioftpd

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.

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-2005-4673?

ioftpd: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2005-4673 being exploited?

CVE-2005-4673 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-2005-4673 affect?

CVE-2005-4673 affects ioftpd. Severity is medium (CVSS 5.0). ioFTPD 0.5.84 u responds with different messages depending on whether or not a username exists, which allows remote attackers to enumerate valid usernames.

How urgent is CVE-2005-4673?

Priority 36/100. No elevated risk signals yet.

References

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