CVE-2006-6264: Teredo creates trusted peer entries for arbitrary incoming source Teredo addresses, even if the low 32 bits...

Security readout for executives and security teams

This CVE describes a Teredo trust issue that could let outside traffic reach some internal hosts despite IPv4 ingress filtering. The risk is most relevant to environments using Teredo or IPv6 transition tunneling, especially with non-RFC1918 internal address space. The provided sources do not identify affected vendors, versions, or a patch. Exposure is unclear from the sources. Likely candidates are networks or endpoints where Teredo is enabled and internal hosts use non-RFC1918 address space. The bundle lists no affected product, version, CPE, or deployment-specific prerequisites. Treat this as a targeted exposure review, not an emergency, unless Teredo is enabled in a sensitive network. The business concern is perimeter bypass for certain internal addressing designs. Prioritize inventory and vendor-guidance checks over broad remediation claims. Mitigation focus: Check current vendor guidance for Teredo configuration, security updates, and supported mitigations.; Inventory whether Teredo or IPv6 transition tunneling is enabled on managed endpoints.; Review network policy for Teredo traffic across perimeter and endpoint controls..

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.