CVE-2006-6266: Microsoft Teredo

Medium severity, CVSS 6.8. EPSS: 11.8% chance of exploitation in the next 30 days.

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.

Affected products

• Microsoft Teredo: any version

Published 2006-12-04. Last modified 2026-06-16.