# CVE-1999-0412: Privilege escalation in n/a

> Attackers can execute arbitrary commands with SYSTEM privileges if IIS runs as SYSTEM and loads an ISAPI extension.

- **Severity:** High 7.5 (`AV:N/AC:L/Au:N/C:P/I:P/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:** 29 Sep 1999
- **Updated:** 1 Aug 2024
- **Also known as:** GHSA-g4g4-39cv-vpgv

## What is CVE-1999-0412?

CVE-1999-0412 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

In IIS and other web servers, an attacker can attack commands as SYSTEM if the server is running as SYSTEM and loading an ISAPI extension.

## Which versions are affected by CVE-1999-0412?

It affects 2 products.


Products: Microsoft Internet Information Server, Microsoft Internet Information Services.

## How do I fix CVE-1999-0412?

No fix has been published for CVE-1999-0412 yet. Limit exposure of the affected software until one is available.

## Is CVE-1999-0412 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-1999-0412 exists.

Public exploit code:

- Microsoft IIS 2.0/3.0/4.0 - ISAPI GetExtensionVersion() (exploitdb)

## Other vulnerabilities in Microsoft Internet Information Server

- [CVE-2008-0075](https://insights.sbomify.com/CVE-2008-0075/): Code injection in n/a (critical 10.0)
- [CVE-1999-1376](https://insights.sbomify.com/CVE-1999-1376/): Buffer overflow in fpcount.exe in IIS 4.0 with FrontPage Server Extensions allows remote attackers to execute arbitrary commands. (critical 10.0)
- [CVE-1999-0407](https://insights.sbomify.com/CVE-1999-0407/): By default, IIS 4.0 has a virtual directory /IISADMPWD which contains files that can be used as proxies for brute force password attacks, or (critical 10.0)
- [CVE-1999-0874](https://insights.sbomify.com/CVE-1999-0874/): Memory corruption in n/a (critical 10.0)
- [CVE-2009-3023](https://insights.sbomify.com/CVE-2009-3023/): Memory corruption in n/a (critical 9.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-1999-0412 and fix it if it is affected.

What it is: CVE-1999-0412 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: It is not confirmed as exploited in the wild, but public exploit code for CVE-1999-0412 exists.

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-1999-0412/ (Markdown: https://insights.sbomify.com/CVE-1999-0412/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-1999-0412
- NVD: https://nvd.nist.gov/vuln/detail/CVE-1999-0412
- OSV: https://osv.dev/vulnerability/CVE-1999-0412

---
From sbomify Insights: https://insights.sbomify.com/CVE-1999-0412/
Summaries are generated and may contain mistakes; the official description above is the record.