CVE-2006-6266: Teredo clients, when following item 6 of RFC4380 section 5.2.3, start direct IPv6 connectivity tests (aka p...

Security readout for executives and security teams

This is a protocol-behavior issue in Teredo clients. A remote party may be able to make a Teredo client send packets toward a third party. The bundle does not identify affected vendors, products, versions, business impact, patch status, or current exploitation. Exposure depends on whether Teredo clients are present and enabled. The source bundle lists affected vendor, product, and version as n/a, so this cannot be mapped to specific platforms from the supplied evidence. Environments without Teredo use are unlikely to be exposed. Treat as an exposure-discovery item unless Teredo is known to be used. There is insufficient evidence for emergency action, but organizations should confirm whether legacy IPv6 transition technology is enabled and align controls with vendor guidance. Mitigation focus: Check vendor guidance for Teredo client updates, configuration, or deprecation advice.; Inventory Teredo and IPv6 transition mechanisms across endpoints and network devices.; Disable or restrict unused Teredo functionality where approved by vendor and business requirements..

Prepared

Jun 29, 2026, 08:58 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.