# CVE-2006-0021: Denial of service in n/a

> Remote attackers can cause a system hang in Windows XP and Server 2003 by sending a malformed IGMP packet.

- **Severity:** High 7.8 (`AV:N/AC:L/Au:N/C:N/I:N/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:** 14 Feb 2006
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-g367-j7q7-9r56

## What is CVE-2006-0021?

CVE-2006-0021 is a high-severity denial of service vulnerability in Microsoft Windows 2003 Server, published on 14 Feb 2006. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Microsoft Windows XP SP1 and SP2, and Server 2003 up to SP1, allows remote attackers to cause a denial of service (hang) via an IGMP packet with an invalid IP option, aka the "IGMP v3 DoS Vulnerability."

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2006-0021?

It affects 2 products.


Products: Microsoft Windows 2003 Server, Microsoft Windows Xp.

## How do I fix CVE-2006-0021?

No fix has been published for CVE-2006-0021 yet. Limit exposure of the affected software until one is available.

## Is CVE-2006-0021 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2006-0021 exists.

Public exploit code:

- Microsoft Windows XP/2003 - IGMP v3 Denial of Service (MS06-007) (1) (exploitdb)
- Microsoft Windows XP/2003 - IGMP v3 Denial of Service (MS06-007) (2) (exploitdb)

## Other vulnerabilities in Microsoft Windows 2003 Server

- [CVE-2008-0015](https://insights.sbomify.com/CVE-2008-0015/): Microsoft Windows Video ActiveX Control Remote Code Execution (high 8.8, exploited in the wild)
- [CVE-2015-1701](https://insights.sbomify.com/CVE-2015-1701/): Microsoft Win32k Privilege Escalation (high 7.8, exploited in the wild)
- [CVE-2013-5065](https://insights.sbomify.com/CVE-2013-5065/): Microsoft Windows Kernel Privilege Escalation (high 7.8, exploited in the wild)
- [CVE-2011-1268](https://insights.sbomify.com/CVE-2011-1268/): Code injection in n/a (critical 10.0)
- [CVE-2011-1868](https://insights.sbomify.com/CVE-2011-1868/): Memory corruption in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2006-0021 and fix it if it is affected.

What it is: CVE-2006-0021 is a high-severity denial of service vulnerability in Microsoft Windows 2003 Server, published on 14 Feb 2006. 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-2006-0021 exists.

Affected product: Microsoft Windows 2003 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-2006-0021/ (Markdown: https://insights.sbomify.com/CVE-2006-0021/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2006-0021
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2006-0021
- OSV: https://osv.dev/vulnerability/CVE-2006-0021

---
From sbomify Insights: https://insights.sbomify.com/CVE-2006-0021/
Summaries are generated and may contain mistakes; the official description above is the record.