# CVE-2004-0257: Denial of service in n/a

> Remote attackers can crash OpenBSD and NetBSD systems by sending specific IPv6 packets to listening ports, causing a denial of service.

- **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:** 1 Sep 2004
- **Updated:** 8 Aug 2024
- **Also known as:** GHSA-vqm2-c8wp-mmg7

## What is CVE-2004-0257?

CVE-2004-0257 is a medium-severity denial of service vulnerability in Netbsd Netbsd, published on 1 Sep 2004. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

OpenBSD 3.4 and NetBSD 1.6 and 1.6.1 allow remote attackers to cause a denial of service (crash) by sending an IPv6 packet with a small MTU to a listening port and then issuing a TCP connect to that port.

## Which versions are affected by CVE-2004-0257?

It affects 2 products.


Products: Netbsd Netbsd, Openbsd Openbsd.

## How do I fix CVE-2004-0257?

No fix has been published for CVE-2004-0257 yet. Limit exposure of the affected software until one is available.

## Is CVE-2004-0257 being exploited?

There is no known exploitation of CVE-2004-0257 in the wild and no public exploit code.

## Other vulnerabilities in Netbsd Netbsd

- [CVE-2017-1000374](https://insights.sbomify.com/CVE-2017-1000374/): Security feature bypass in n/a (critical 9.8)
- [CVE-2017-1000375](https://insights.sbomify.com/CVE-2017-1000375/): Memory corruption in n/a (critical 9.8)
- [CVE-2017-1000378](https://insights.sbomify.com/CVE-2017-1000378/): Denial of service in n/a (critical 9.8)
- [CVE-2015-8212](https://insights.sbomify.com/CVE-2015-8212/): Command injection in n/a (critical 9.8)
- [CVE-2008-3584](https://insights.sbomify.com/CVE-2008-3584/): Denial of service in n/a (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2004-0257 and fix it if it is affected.

What it is: CVE-2004-0257 is a medium-severity denial of service vulnerability in Netbsd Netbsd, published on 1 Sep 2004. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2004-0257 in the wild and no public exploit code.

Affected product: Netbsd Netbsd. 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-2004-0257/ (Markdown: https://insights.sbomify.com/CVE-2004-0257/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2004-0257
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2004-0257
- OSV: https://osv.dev/vulnerability/CVE-2004-0257

---
From sbomify Insights: https://insights.sbomify.com/CVE-2004-0257/
Summaries are generated and may contain mistakes; the official description above is the record.