CVE-2025-23018 Information

Description

IPv4-in-IPv6 and IPv6-in-IPv6 tunneling (RFC 2473) do not require the validation or verification of the source of a network packet allowing an attacker to spoof and route arbitrary traffic via an exposed network interface. This is a similar issue to CVE-2020-10136.

Reference

https://datatracker.ietf.org/doc/html/rfc2473 https://papers.mathyvanhoef.com/usenix2025-tunnels.pdf https://www.top10vpn.com/research/tunneling-protocol-vulnerability/