# CVE-2002-0438: Denial of service in n/a

> Remote attackers can cause a denial of service on ZyXEL ZyWALL firewalls by sending malformed ARP packets, disabling the LAN interface.

- **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:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Jun 2002
- **Updated:** 8 Aug 2024
- **Also known as:** GHSA-c9q2-8cmh-3jvf

## What is CVE-2002-0438?

CVE-2002-0438 is a medium-severity denial of service vulnerability in n/a, published on 11 Jun 2002. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

ZyXEL ZyWALL 10 before 3.50 allows remote attackers to cause a denial of service via an ARP packet with the firewall's IP address and an incorrect MAC address, which causes the firewall to disable the LAN interface.

## Which versions are affected by CVE-2002-0438?

It affects 1 product.


Products: Zyxel Zywall10.

## How do I fix CVE-2002-0438?

No fix has been published for CVE-2002-0438 yet. Limit exposure of the affected software until one is available.

## Is CVE-2002-0438 being exploited?

There is no known exploitation of CVE-2002-0438 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2004-1789](https://insights.sbomify.com/CVE-2004-1789/): Cross-site scripting in n/a (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2002-0438 and fix it if it is affected.

What it is: CVE-2002-0438 is a medium-severity denial of service vulnerability in n/a, published on 11 Jun 2002. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2002-0438 in the wild and no public exploit code.

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-2002-0438/ (Markdown: https://insights.sbomify.com/CVE-2002-0438/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2002-0438
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2002-0438
- OSV: https://osv.dev/vulnerability/CVE-2002-0438

---
From sbomify Insights: https://insights.sbomify.com/CVE-2002-0438/
Summaries are generated and may contain mistakes; the official description above is the record.