CVE-2006-1651

Isa Server vulnerability

CVSS

7.5

EPSS

15.2%

EPSS pct

96th

Exploited

No known

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.

Affected vendor

Microsoft

Affected product

Isa Server

CVSS vector

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

Published

2006-04-06

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no authentication. Successful exploitation leads to partial impact to confidentiality, partial impact to integrity, partial impact to availability.

Its EPSS score of 15.2% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 96% of all scored CVEs.

Check your external exposure to CVE-2006-1651

Confirm whether Microsoft Isa Server is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2006-1651.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2006-1651

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2006-1651 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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