CVE-2006-6565: FileZilla Server before 0.9.22 allows remote attackers to cause a denial of service (crash) via a wildcard arg

Q: How do I fix CVE-2006-6565?

filezilla server: upgrade to 0.9.22. Exact commands for each OS are on this page.

Q: Is CVE-2006-6565 being exploited?

CVE-2006-6565 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2006-6565 affect?

CVE-2006-6565 affects filezilla server. Severity is medium (CVSS 4.0). FileZilla Server before 0.9.22 allows remote attackers to cause a denial of service (crash) via a wildcard argument to the (1) LIST or (2) NLST commands, which results in a NULL pointer dereference, a different set of vectors than CVE-2006-

Q: How urgent is CVE-2006-6565?

Priority 44/100. EPSS top 1%: very likely to be exploited; Public exploit reference

This week

MEDIUM 4.0UPGRADE

CVE-2006-6565 is a medium-severity flaw (CVSS 4.0) affecting filezilla server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FileZilla Server before 0.9.22 allows remote attackers to cause a denial of service (crash) via a wildcard argument to the (1) LIST or (2) NLST commands, which results in a NULL pointer dereference, a different set of vectors than CVE-2006-6564. NOTE: CVE analysis suggests that the problem might be due to a malformed PORT command.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	4.0 (Medium)
EPSS exploit chance	70.6% (top 1%)
CISA exploited list	No
Weakness	CWE-476
Published	2006-12-15
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: filezilla-project

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

Am I affected?

Timeline

2006-12-15 11:28 UTCPublished CVE record published
2026-06-16 22:33 UTCUpdated Record last modified

filezilla-project filezilla server UPGRADE

Affected: < 0.9.22

Fixed in: 0.9.22

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.9.22 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade filezilla-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade filezilla-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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: FileZilla FTP Server 0.9.21 - 'LIST/NLST' Denial of Service
Metasploit: FileZilla FTP Server Malformed PORT Denial of Service
Nuclei scan template: FileZilla Server < 0.9.22 - DoS via Wildcard Commands

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-2006-6565?

filezilla server: upgrade to 0.9.22. Exact commands for each OS are on this page.

Is CVE-2006-6565 being exploited?

CVE-2006-6565 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-2006-6565 affect?

CVE-2006-6565 affects filezilla server. Severity is medium (CVSS 4.0). FileZilla Server before 0.9.22 allows remote attackers to cause a denial of service (crash) via a wildcard argument to the (1) LIST or (2) NLST commands, which results in a NULL pointer dereference, a different set of vectors than CVE-2006-

How urgent is CVE-2006-6565?

Priority 44/100. EPSS top 1%: very likely to be exploited; Public exploit reference

Software pages

FileZilla vulnerabilities

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References

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