CVE-2025-23018: ipv6 (CVSS 5.4)

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.

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CVSS v3.1 Score

5.4

MEDIUM

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

Weakness Type (CWE)

CWE-940 CWE-940

Affected Products

Vendor	Product	Versions
ietf	ipv6	All

References

Other References

https://datatracker.ietf.org/doc/html/rfc2473 https://papers.mathyvanhoef.com/usenix2025-tunnels.pdf https://www.top10vpn.com/research/tunneling-protocol-vulnerability/ https://www.kb.cert.org/vuls/id/199397

Frequently Asked Questions

What is CVE-2025-23018? +

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. It has a CVSS v3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2025-23018? +

CVE-2025-23018 has a CVSS v3.1 score of 5.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-23018? +

CVE-2025-23018 affects products from ietf, specifically: ipv6. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-23018? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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