# CVE-2006-6565: Null dereference in n/a

> Remote attackers can crash FileZilla Server via malformed FTP commands, causing a denial of service.

- **Severity:** Medium 4.0 (`AV:N/AC:L/Au:S/C:N/I:N/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Dec 2006
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-42fr-8xjf-ghxh

## What is CVE-2006-6565?

CVE-2006-6565 is a medium-severity vulnerability in n/a, published on 15 Dec 2006. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

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.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2006-6565?

It affects 1 product.


Products: Filezilla-Project Filezilla Server.

## How do I fix CVE-2006-6565?

No fix has been published for CVE-2006-6565 yet. Limit exposure of the affected software until one is available.

## Is CVE-2006-6565 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2006-6565 exists.

Public exploit code:

- FileZilla FTP Server 0.9.21 - 'LIST/NLST' Denial of Service (exploitdb)
- FileZilla FTP Server Malformed PORT Denial of Service (metasploit)
- FileZilla Server < 0.9.22 - DoS via Wildcard Commands (nuclei)

## Other vulnerabilities in n/a

- [CVE-2005-0850](https://insights.sbomify.com/CVE-2005-0850/): Denial of service in n/a (medium 5.0)
- [CVE-2005-0851](https://insights.sbomify.com/CVE-2005-0851/): Denial of service in n/a (medium 5.0)
- [CVE-2015-10003](https://insights.sbomify.com/CVE-2015-10003/): FileZilla Server PORT confused deputy (medium 4.3)
- [CVE-2009-0884](https://insights.sbomify.com/CVE-2009-0884/): Memory corruption in n/a (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2006-6565 and fix it if it is affected.

What it is: CVE-2006-6565 is a medium-severity vulnerability in n/a, published on 15 Dec 2006. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2006-6565 exists.

Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2006-6565/ (Markdown: https://insights.sbomify.com/CVE-2006-6565/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2006-6565
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2006-6565
- OSV: https://osv.dev/vulnerability/CVE-2006-6565

---
From sbomify Insights: https://insights.sbomify.com/CVE-2006-6565/
Summaries are generated and may contain mistakes; the official description above is the record.