Is CVE-2006-1651 in the CISA KEV catalog?

No. CVE-2006-1651 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2006-1651?

CVE-2006-1651 has a CVSS v2 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2006-1651?

CVE-2006-1651 has an EPSS score of 15.19% (96th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2006-1651

HIGHEPSS 96th pctl

7.5

CVSS v2

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.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

15.19%probability of exploitation in 30 days

96thpercentile

Very high risk: more likely to be exploited than 96% of all known CVEs.

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-16.