CVE-2025-23018 — MEDIUM (5.4)

Vulnerability 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.

CVSS Score

5.4

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Ietf	Ipv6	-

Related Weaknesses (CWE)

CWE-940

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

FAQ

What is CVE-2025-23018?

CVE-2025-23018 is a vulnerability with a CVSS score of 5.4 (MEDIUM). 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 exp...

How severe is CVE-2025-23018?

CVE-2025-23018 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2025-23018?

Check the references section above for vendor advisories and patch information. Affected products include: Ietf Ipv6.