# CVE-2009-4105: Denial of service in n/a

> Authenticated remote attackers can crash TYPSoft FTP Server by sending APPE and DELE commands without file data, causing denial of service.

- **Severity:** Low 3.5 (`AV:N/AC:M/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:** 28 Nov 2009
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-4h79-c4ph-6hc8

## What is CVE-2009-4105?

CVE-2009-4105 is a low-severity denial of service vulnerability in n/a, published on 28 Nov 2009. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

TYPSoft FTP Server 1.10 allows remote authenticated users to cause a denial of service (crash) by sending an APPE (append) command immediately followed by a DELE (delete) command without sending file data in between these two commands.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2009-4105?

It affects 1 product.


Products: Typsoft Typsoft Ftp Server.

## How do I fix CVE-2009-4105?

No fix has been published for CVE-2009-4105 yet. Limit exposure of the affected software until one is available.

## Is CVE-2009-4105 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2009-4105 exists.

Public exploit code:

- TYPSoft FTP Server 1.10 - APPE DELE Denial of Service (exploitdb)

## Other vulnerabilities in n/a

- [CVE-2005-3294](https://insights.sbomify.com/CVE-2005-3294/): Denial of service in n/a (medium 5.0)
- [CVE-2002-1354](https://insights.sbomify.com/CVE-2002-1354/): Path traversal in n/a (medium 5.0)
- [CVE-2004-0252](https://insights.sbomify.com/CVE-2004-0252/): Denial of service in n/a (medium 5.0)
- [CVE-2002-0558](https://insights.sbomify.com/CVE-2002-0558/): Path traversal in n/a (medium 5.0)
- [CVE-2001-1156](https://insights.sbomify.com/CVE-2001-1156/): Denial of service in n/a (medium 5.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2009-4105 and fix it if it is affected.

What it is: CVE-2009-4105 is a low-severity denial of service vulnerability in n/a, published on 28 Nov 2009. 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-2009-4105 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-2009-4105/ (Markdown: https://insights.sbomify.com/CVE-2009-4105/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2009-4105
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2009-4105
- OSV: https://osv.dev/vulnerability/CVE-2009-4105

---
From sbomify Insights: https://insights.sbomify.com/CVE-2009-4105/
Summaries are generated and may contain mistakes; the official description above is the record.