Which products and versions are affected by CVE-2006-0021?

Affected: Windows 2003 Server (Microsoft) versions datacenter_64-bit-sp1, enterprise, enterprise_64-bit, enterprise-sp1, r2, r2-sp1, standard, standard_64-bit; Windows Xp (Microsoft). The full list is in the CVE brief.

Is CVE-2006-0021 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2006-0021 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2006-0021?

Public exploit code is available.

Is there a fix for CVE-2006-0021?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2006-0021 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2006-0021

HighPublic exploit

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."

Published Feb 14, 2006 · Updated Apr 15, 2026

Key Facts

Patch immediately

CVE-2006-0021 is a high-severity vulnerability (CVSS 7.8 v2) affecting Windows 2003 Server (Microsoft), Windows Xp (Microsoft).
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 63% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v2

7.8

AV:N/AC:L/Au:N/C:N/I:N/A:C

EPSS (30-day exploit likelihood)

63%

Higher than 99.1% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2006-0021 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Affected Products

24 affected entries in total

Product	Affected versions	Fixed in
Windows 2003 ServerMicrosoft	datacenter_64-bit-sp1, enterprise, enterprise_64-bit, enterprise-sp1, r2, r2-sp1, standard, standard_64-bit	n/a
Windows XpMicrosoft	See advisory	n/a

Timeline

Publicly disclosed
Feb 14, 2006
Last updated
Apr 15, 2026

Weakness Type

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

advisoryVU#839284
advisoryTA06-045A
advisoryADV-2006-0576
patch18853
patch16645

12 more references in the full CVE brief

FAQ

Common Questions.

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."
Affected: Windows 2003 Server (Microsoft) versions datacenter_64-bit-sp1, enterprise, enterprise_64-bit, enterprise-sp1, r2, r2-sp1, standard, standard_64-bit; Windows Xp (Microsoft). The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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