CVE-2006-6673: WinFtp Server 2.0.2 allows remote attackers to cause a denial of service (crash) via long (1) PASV, (2) LIST,

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MEDIUM 5.0DOWNGRADE

CVE-2006-6673 is a medium-severity flaw (CVSS 5.0) affecting winftp server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

WinFtp Server 2.0.2 allows remote attackers to cause a denial of service (crash) via long (1) PASV, (2) LIST, (3) USER, (4) PORT, and possibly other commands.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	3.0% (top 13%)
CISA exploited list	No
Published	2006-12-21
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: winftp server

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

Am I affected?

Timeline

2006-12-21 01:28 UTCPublished CVE record published
2026-06-16 22:33 UTCUpdated Record last modified

winftp server winftp server DOWNGRADE

Affected: 2.0.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.2

1. Check installed version

apt-cache policy winftp-server || rpm -q winftp-server || winftp-server --version

2. No fixed release: DOWNGRADE to a release before 2.0.2 (Debian / Ubuntu)

apt-cache madison winftp-server sudo apt install winftp-server=<VERSION_BEFORE_2.0.2> sudo apt-mark hold winftp-server

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

dnf --showduplicates list winftp-server sudo dnf downgrade winftp-server-<VERSION_BEFORE_2.0.2> sudo dnf versionlock add winftp-server

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: WinFTP Server 2.0.2 - 'PASV' Remote Denial of Service

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-2006-6673?

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

Is CVE-2006-6673 being exploited?

CVE-2006-6673 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-2006-6673 affect?

CVE-2006-6673 affects winftp server. Severity is medium (CVSS 5.0). WinFtp Server 2.0.2 allows remote attackers to cause a denial of service (crash) via long (1) PASV, (2) LIST, (3) USER, (4) PORT, and possibly other commands.

How urgent is CVE-2006-6673?

Priority 44/100. Public exploit reference

Related CVEs

CVE-2004-2400 LOW 2.1 DOWNGRADE WinFTP Server 1.6 stores username and password credentials in plaintext in the data\user.wfd file, which allow

References

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