# CVE-2006-1999: Denial of service in n/a

> Remote attackers can cause a denial of service in OpenTTD by sending malformed UDP packets, forcing the client to return to the main menu.

- **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:** No
- **Published:** 25 Apr 2006
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-4w8q-c6h3-w87x

## What is CVE-2006-1999?

CVE-2006-1999 is a medium-severity denial of service vulnerability in n/a, published on 25 Apr 2006. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The multiplayer menu in OpenTTD 0.4.7 allows remote attackers to cause a denial of service via a UDP packet with an incorrect size, which causes the client to return to the main menu.

## Which versions are affected by CVE-2006-1999?

It affects 1 product.


Products: Openttd Openttd.

## How do I fix CVE-2006-1999?

No fix has been published for CVE-2006-1999 yet. Limit exposure of the affected software until one is available.

## Is CVE-2006-1999 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2006-1999 exists.

Public exploit code:

- OpenTTD 0.4.7 - Multiple Vulnerabilities (exploitdb)

## Other vulnerabilities in n/a

- [CVE-2008-3576](https://insights.sbomify.com/CVE-2008-3576/): Memory corruption in n/a (critical 10.0)
- [CVE-2008-3547](https://insights.sbomify.com/CVE-2008-3547/): Memory corruption in n/a (critical 9.0)
- [CVE-2011-3341](https://insights.sbomify.com/CVE-2011-3341/): Integer overflow in n/a (high 7.5)
- [CVE-2011-3342](https://insights.sbomify.com/CVE-2011-3342/): Memory corruption in n/a (high 7.5)
- [CVE-2005-2764](https://insights.sbomify.com/CVE-2005-2764/): Memory corruption in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2006-1999 and fix it if it is affected.

What it is: CVE-2006-1999 is a medium-severity denial of service vulnerability in n/a, published on 25 Apr 2006. 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-2006-1999 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-2006-1999/ (Markdown: https://insights.sbomify.com/CVE-2006-1999/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2006-1999
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2006-1999
- OSV: https://osv.dev/vulnerability/CVE-2006-1999

---
From sbomify Insights: https://insights.sbomify.com/CVE-2006-1999/
Summaries are generated and may contain mistakes; the official description above is the record.