# CVE-1999-1591: Microsoft Internet Information Services (IIS) server 4.0 SP4, without certain hotfixes released for SP4, does not require authentication cre


- **Severity:** High 7.5 (`AV:N/AC:L/Au:N/C:P/I:P/A:P`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 5 Jul 2007
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-x4j4-xc7j-8rv5

## What is CVE-1999-1591?

CVE-1999-1591 is a high-severity vulnerability in Microsoft Internet Information Server, published on 5 Jul 2007. 

### Official description

Microsoft Internet Information Services (IIS) server 4.0 SP4, without certain hotfixes released for SP4, does not require authentication credentials under certain conditions, which allows remote attackers to bypass authentication requirements, as demonstrated by connecting via Microsoft Visual InterDev 6.0.

## Which versions are affected by CVE-1999-1591?

It affects 2 products.


Products: Microsoft Internet Information Server, Microsoft Visual Interdev.

## How do I fix CVE-1999-1591?

No fix has been published for CVE-1999-1591 yet. Limit exposure of the affected software until one is available.

## Is CVE-1999-1591 being exploited?

There is no known exploitation of CVE-1999-1591 in the wild and no public exploit code.

## 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-1999-1591 and fix it if it is affected.

What it is: CVE-1999-1591 is a high-severity vulnerability in Microsoft Internet Information Server, published on 5 Jul 2007. 
Exploitation: There is no known exploitation of CVE-1999-1591 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-1999-1591/ (Markdown: https://insights.sbomify.com/CVE-1999-1591/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-1999-1591
- NVD: https://nvd.nist.gov/vuln/detail/CVE-1999-1591
- OSV: https://osv.dev/vulnerability/CVE-1999-1591

---
From sbomify Insights: https://insights.sbomify.com/CVE-1999-1591/
Summaries are generated and may contain mistakes; the official description above is the record.