CVE-2025-23018: IETF IPv6

Medium severity, CVSS 6.5. EPSS: 1% chance of exploitation in the next 30 days.

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.

Affected products

• IETF IPv6: affected versions not specified

Published 2025-01-14. Last modified 2026-06-17.