CVE-2006-4318: Buffer overflow in WFTPD Server 3.23 allows remote attackers to execute arbitrary code via long SIZE commands.

This week

MEDIUM 6.5DOWNGRADE

CVE-2006-4318 is a medium-severity flaw (CVSS 6.5) affecting wftpd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in WFTPD Server 3.23 allows remote attackers to execute arbitrary code via long SIZE commands.

Why this priority

EPSS top 1%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	6.5 (Medium)
EPSS exploit chance	62.1% (top 1%)
CISA exploited list	No
Published	2006-08-24
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: texas imperial software

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

Am I affected?

Timeline

2006-08-24 01:04 UTCPublished CVE record published
2026-06-16 22:28 UTCUpdated Record last modified

texas imperial software wftpd DOWNGRADE

Affected: 3.23

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.23

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.23 (Debian / Ubuntu)

apt-cache madison wftpd sudo apt install wftpd=<VERSION_BEFORE_3.23> sudo apt-mark hold wftpd

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

dnf --showduplicates list wftpd sudo dnf downgrade wftpd-<VERSION_BEFORE_3.23> sudo dnf versionlock add wftpd

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Texas Imperial Software WFTPD 3.23 - 'SIZE' Remote Buffer Overflow
Exploit-DB: Texas Imperial Software WFTPD 3.23 - SIZE Overflow (Metasploit)
Metasploit: Texas Imperial Software WFTPD 3.23 SIZE Overflow

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-2006-4318?

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

Is CVE-2006-4318 being exploited?

CVE-2006-4318 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-2006-4318 affect?

CVE-2006-4318 affects wftpd. Severity is medium (CVSS 6.5). Buffer overflow in WFTPD Server 3.23 allows remote attackers to execute arbitrary code via long SIZE commands.

How urgent is CVE-2006-4318?

Priority 53/100. EPSS top 1%: very likely to be exploited; Public exploit reference

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References

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