# CVE-1999-0200: Auth bypass in n/a

> Attackers can bypass authentication on Windows NT FTP servers if the guest account is enabled without a password, allowing unauthorized file access.

- **Severity:** Critical 10.0 (`AV:N/AC:L/Au:N/C:C/I:C/A:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Feb 2000
- **Updated:** 1 Aug 2024
- **Also known as:** GHSA-wjhq-9p29-m98h

## What is CVE-1999-0200?

CVE-1999-0200 is a critical authentication bypass vulnerability in n/a, published on 4 Feb 2000. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Windows NT FTP server (WFTP) with the guest account enabled without a password allows an attacker to log into the FTP server using any username and password.

## Which versions are affected by CVE-1999-0200?


## How do I fix CVE-1999-0200?

No fix has been published for CVE-1999-0200 yet. Limit exposure of the affected software until one is available.

## Is CVE-1999-0200 being exploited?

There is no known exploitation of CVE-1999-0200 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-1999-0200 and fix it if it is affected.

What it is: CVE-1999-0200 is a critical authentication bypass vulnerability in n/a, published on 4 Feb 2000. 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-1999-0200 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-1999-0200/ (Markdown: https://insights.sbomify.com/CVE-1999-0200/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-1999-0200
- NVD: https://nvd.nist.gov/vuln/detail/CVE-1999-0200
- OSV: https://osv.dev/vulnerability/CVE-1999-0200

---
From sbomify Insights: https://insights.sbomify.com/CVE-1999-0200/
Summaries are generated and may contain mistakes; the official description above is the record.