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Fencer Vulns
high 7.5

CVE-2006-1651 in the critical feed json

Microsoft ISA Server 2004 allows remote attackers to bypass certain filtering rules, including ones for (1) ICMP and (2) TCP, via IPv6 pack…

published 2006-04-06 20 y ago modified 2026-06-16 4 mo ago also EUVD-2006-1652

cvss
7.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
15.0%
EPSS 15.0% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

Summary

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.

Exploit prediction

14.95% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.