# CVE-2004-0656: Denial of service in n/a

> Remote attackers can cause a denial of service in PureFTPd by exceeding the maximum number of connections.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:N/I:N/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 13 Jul 2004
- **Updated:** 8 Aug 2024
- **Also known as:** DEBIAN-CVE-2004-0656, GHSA-g7m6-w6x3-gg99

## What is CVE-2004-0656?

CVE-2004-0656 is a medium-severity denial of service vulnerability in n/a, published on 13 Jul 2004. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The accept_client function in PureFTPd 1.0.18 and earlier allows remote attackers to cause a denial of service by exceeding the maximum number of connections.

## Which versions are affected by CVE-2004-0656?

It affects 1 product.


Products: Pureftpd Pureftpd.

## How do I fix CVE-2004-0656?

Upgrade to a fixed version.

## Is CVE-2004-0656 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2004-0656 exists.

Public exploit code:

- Pure-FTPd ≤ 1.0.18 - DoS via Connection Limit Exhaustion (nuclei)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2004-0656 and fix it if it is affected.

What it is: CVE-2004-0656 is a medium-severity denial of service vulnerability in n/a, published on 13 Jul 2004. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2004-0656 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-2004-0656/ (Markdown: https://insights.sbomify.com/CVE-2004-0656/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2004-0656
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2004-0656
- OSV: https://osv.dev/vulnerability/CVE-2004-0656

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From sbomify Insights: https://insights.sbomify.com/CVE-2004-0656/
Summaries are generated and may contain mistakes; the official description above is the record.