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Vulnerability record · CVE-2006-6266 · published 4 December 2006

CVE-2006-6266: Microsoft teredo vulnerability

Microsoft · Teredo

Teredo clients, when following item 6 of RFC4380 section 5.2.3, start direct IPv6 connectivity tests (aka ping tests) in response to packets from non-Teredo source addresses, which might allow remote attackers to induce Teredo clients to send packets to third parties.

6.8 CVSS 2.0 Medium EPSS 12% · top 4.1%
6.8CVSS 2.0 base score
12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
16 Jun 2026Last modified by NVD

Description

Teredo clients, when following item 6 of RFC4380 section 5.2.3, start direct IPv6 connectivity tests (aka ping tests) in response to packets from non-Teredo source addresses, which might allow remote attackers to induce Teredo clients to send packets to third parties.

AV:N/AC:M/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/1/452989/100/0/threaded
http://www.securityfocus.com/archive/1/452996/100/0/threaded
http://www.symantec.com/avcenter/reference/Teredo_Security.pdf Vendor Advisory
http://www.securityfocus.com/archive/1/452989/100/0/threaded
http://www.securityfocus.com/archive/1/452996/100/0/threaded
http://www.symantec.com/avcenter/reference/Teredo_Security.pdf Vendor Advisory

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Related vulnerabilities

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

7.5CVE-2006-6264Microsoft teredo vulnerabilityTeredo creates trusted peer entries for arbitrary incoming source Teredo addresses, even if the low 32 bits represent an intranet address, which migh…EPSS 14%6.8CVE-2006-6263Microsoft teredo vulnerabilityTeredo clients, when source routing is enabled, recognize a Routing header in an encapsulated IPv6 packet and send the packet to the next hop, which …EPSS 12%5.8CVE-2006-6265Microsoft teredo vulnerabilityTeredo clients, when located behind a restricted NAT, allow remote attackers to establish an inbound connection without the guessing required to find…EPSS 4.5%

Source: NIST National Vulnerability Database (record CVE-2006-6266), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.