# CVE-1999-0012: Security feature bypass in n/a

> Remote attackers can bypass access restrictions on files with long names in Windows web servers, potentially reading protected data.

- **Severity:** High 7.0 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Sep 1999
- **Updated:** 9 Apr 2025
- **Also known as:** GHSA-rvjj-5hjr-3fjf

## What is CVE-1999-0012?

CVE-1999-0012 is a high-severity vulnerability in Microsoft Internet Information Server, published on 29 Sep 1999. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Some web servers under Microsoft Windows allow remote attackers to bypass access restrictions for files with long file names.

Weakness: CWE-290 (Authentication Bypass by Spoofing)

## Which versions are affected by CVE-1999-0012?

It affects 5 products.


Products: Microsoft Frontpage, Microsoft Internet Information Server, Microsoft Personal Web Server, Netscape Enterprise Server, Netscape Fasttrack Server.

## How do I fix CVE-1999-0012?

No fix has been published for CVE-1999-0012 yet. Limit exposure of the affected software until one is available.

## Is CVE-1999-0012 being exploited?

There is no known exploitation of CVE-1999-0012 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Internet Information Server

- [CVE-2004-0573](https://insights.sbomify.com/CVE-2004-0573/): Memory corruption in n/a (high 7.5)
- [CVE-2000-0746](https://insights.sbomify.com/CVE-2000-0746/): Cross-site scripting in n/a (high 7.5)
- [CVE-2000-0260](https://insights.sbomify.com/CVE-2000-0260/): Memory corruption in n/a (high 7.5)
- [CVE-2000-0256](https://insights.sbomify.com/CVE-2000-0256/): Memory corruption in n/a (high 7.5)
- [CVE-2007-3109](https://insights.sbomify.com/CVE-2007-3109/): Path traversal in n/a (medium 6.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-1999-0012 and fix it if it is affected.

What it is: CVE-1999-0012 is a high-severity vulnerability in Microsoft Internet Information Server, published on 29 Sep 1999. 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-1999-0012 in the wild and no public exploit code.

Affected product: Microsoft Internet Information Server. 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-1999-0012/ (Markdown: https://insights.sbomify.com/CVE-1999-0012/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-1999-0012
- NVD: https://nvd.nist.gov/vuln/detail/CVE-1999-0012
- OSV: https://osv.dev/vulnerability/CVE-1999-0012

---
From sbomify Insights: https://insights.sbomify.com/CVE-1999-0012/
Summaries are generated and may contain mistakes; the official description above is the record.