CVE-2025-23019

Name: CVE-2025-23019
Creator: NVD / NIST
Published: 2025-01-14T20:15:32.577+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.93%

Last modified Jun 17, 2026

CVE-2025-23019 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. IPv6-in-IPv4 tunneling (RFC 4213) allows an attacker to spoof and route traffic via an exposed network interface.. EPSS estimates a 0.93% chance of exploitation in the next 30 days.

Description

IPv6-in-IPv4 tunneling (RFC 4213) allows an attacker to spoof and route traffic via an exposed network interface.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.93%

56.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-940

Affected Software

Vendor	Product	Versions
Ietf	Ipv6	All versions

References

https://datatracker.ietf.org/doc/html/rfc4213Technical 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
Status: Modified

Frequently Asked Questions

What is CVE-2025-23019?

IPv6-in-IPv4 tunneling (RFC 4213) allows an attacker to spoof and route traffic via an exposed network interface.

How severe is CVE-2025-23019?

CVE-2025-23019 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.93% probability of exploitation in the next 30 days.

How do I fix CVE-2025-23019?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-23019?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST