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Vulnerability record · CVE-2025-23018 · published 14 January 2025

CVE-2025-23018: Ietf ipv6 vulnerability

IIetf · Ipv6

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.

6.5 CVSS 3.1 Medium EPSS 1.0% · top 37.2% CWE-940 · CWE-940
6.5CVSS 3.1 base score
1.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.6CVE-2016-10142Ietf ipv6 vulnerabilityAn issue was discovered in the IPv6 protocol specification, related to ICMP Packet Too Big (PTB) messages. (The scope of this CVE is all affected IPv…EPSS 2.8%7.8CVE-2007-2242Ietf ipv6 vulnerabilityThe IPv6 protocol allows remote attackers to cause a denial of service via crafted IPv6 type 0 route headers (IPV6_RTHDR_TYPE_0) that create network …EPSS 5.0%6.5CVE-2025-23019Ietf ipv6 vulnerabilityIPv6-in-IPv4 tunneling (RFC 4213) allows an attacker to spoof and route traffic via an exposed network interface.EPSS 1.0%9.3CVE-2025-61932Lanscope Endpoint Manager improper origin verification allows RCELanscope Endpoint Manager (On-Premises), in both the Client program (MR) and Detection agent (DA), does not properly verify the origin of incoming re…KEVEPSS 2.8%analysed

Source: NIST National Vulnerability Database (record CVE-2025-23018), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.