CVE-2006-0021

What it is

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."

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

62.9% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2005-11-30 00:00 UTC ReservedThe CVE id was reserved by its CNA
2. 2006-02-14 19:06 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2026-06-16 22:19 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 62.9% in the next 30 days (EPSS).
• Severity: 7.8 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2006-02-14 19:06 UTC

Last modified

2026-06-16 22:19 UTC

Exploit probability

62.9% · EPSS, next 30 days

Weakness

CWE-119 · Buffer errors

Record status

Modified

Affected

• Microsoft Windows 2003 Server datacenter_64-bit
• Microsoft Windows 2003 Server Enterprise
• Microsoft Windows 2003 Server enterprise_64-bit
• Microsoft Windows 2003 Server r2
• Microsoft Windows 2003 Server Standard
• Microsoft Windows 2003 Server standard_64-bit
• Microsoft Windows 2003 Server Web
• Microsoft Windows Xp

Attack profile CVSS 2.0 · 7.8

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2006-0021.md and follow it. Check whether this project is affected by CVE-2006-0021. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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