CVE-2006-2173: Buffer overflow in FileZilla FTP Server 2.2.22 allows remote authenticated attackers to cause a denial of serv

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MEDIUM 6.4MITIGATE

CVE-2006-2173 is a medium-severity flaw (CVSS 6.4) affecting filezilla server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in FileZilla FTP Server 2.2.22 allows remote authenticated attackers to cause a denial of service and possibly execute arbitrary code via a long (1) PORT or (2) PASS followed by the MLSD command, or (2) the remote server interface, as demonstrated by the Infigo FTPStress Fuzzer.

Why this priority

EPSS top 6%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	6.4 (Medium)
EPSS exploit chance	6.7% (top 6%)
CISA exploited list	No
Published	2006-05-04
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: filezilla

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

Am I affected?

Timeline

2006-05-04 12:38 UTCPublished CVE record published
2026-06-16 22:24 UTCUpdated Record last modified

filezilla filezilla server MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

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

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Public exploits and detection

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

Nuclei scan template: FileZilla FTP Server 2.2.22 - Buffer 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-2006-2173?

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

Is CVE-2006-2173 being exploited?

CVE-2006-2173 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-2006-2173 affect?

CVE-2006-2173 affects filezilla server. Severity is medium (CVSS 6.4). Buffer overflow in FileZilla FTP Server 2.2.22 allows remote authenticated attackers to cause a denial of service and possibly execute arbitrary code via a long (1) PORT or (2) PASS followed by the MLSD command, or (2) the remote server int

How urgent is CVE-2006-2173?

Priority 51/100. EPSS top 6%: very likely to be exploited; Public exploit reference

Software pages

FileZilla vulnerabilities

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References

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