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Vulnerability record · CVE-2006-1651 · published 6 April 2006

CVE-2006-1651: Microsoft isa server vulnerability

Microsoft · Isa Server

Microsoft ISA Server 2004 allows remote attackers to bypass certain filtering rules, including ones for (1) ICMP and (2) TCP, via IPv6 packets. NOTE: An established researcher has disputed this issue, saying that "Neither ISA Server 2004 nor Windows 2003 Basic Firewall support IPv6 filtering ... This is different network protocol.

7.5 CVSS 2.0 High EPSS 15% · top 3.4%
7.5CVSS 2.0 base score
15%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
16 Jun 2026Last modified by NVD

Description

Microsoft ISA Server 2004 allows remote attackers to bypass certain filtering rules, including ones for (1) ICMP and (2) TCP, via IPv6 packets. NOTE: An established researcher has disputed this issue, saying that "Neither ISA Server 2004 nor Windows 2003 Basic Firewall support IPv6 filtering ... This is different network protocol.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/archive/1/429816/100/0/threaded
http://www.securityfocus.com/archive/1/429846/100/0/threaded
http://www.securityfocus.com/archive/1/430281/100/0/threaded
http://www.securityfocus.com/archive/1/430684/100/0/threaded
http://www.securityfocus.com/archive/1/429816/100/0/threaded
http://www.securityfocus.com/archive/1/429846/100/0/threaded
http://www.securityfocus.com/archive/1/430281/100/0/threaded
http://www.securityfocus.com/archive/1/430684/100/0/threaded

Track CVE-2006-1651 inside VULONE

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2006-1651), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.