CVE-2025-23018

MediumCVSS 6.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L

Weakness enumeration

CWE-940

Affected software

Vendor	Product	Versions
IETF	IPv6	6

References

https://datatracker.ietf.org/doc/html/rfc2473Technical Description
https://papers.mathyvanhoef.com/usenix2025-tunnels.pdfTechnical Description
https://www.top10vpn.com/research/tunneling-protocol-vulnerability/Technical Description
https://www.kb.cert.org/vuls/id/199397

Timeline

Published: Jan 14, 2025
Last modified: Jun 17, 2026
NVD status: Modified

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