CVE-2006-0021

CVE-2006-0021 is a high-severity vulnerability in Microsoft Windows 2003 Server with a CVSS 2.0 base score of 7.8. Its EPSS exploit-prediction score of 63% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

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."

Frequently asked questions

What is CVE-2006-0021?
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."
How severe is CVE-2006-0021?
CVE-2006-0021 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2006-0021 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 63% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-0021?
CVE-2006-0021 primarily affects Microsoft Windows 2003 Server. In total, 24 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2006-0021?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2006-0021 published?
CVE-2006-0021 was published on 2006-02-14 and last updated on 2026-06-16.

References

Affected products (24)

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