CVE-2025-23018

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.

Category

5.4
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.06%
Affected: IETF IPv6
Published at:
Updated at:

References

Link Tags
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

Frequently Asked Questions

What is the severity of CVE-2025-23018?
CVE-2025-23018 has been scored as a medium severity vulnerability.
How to fix CVE-2025-23018?
To fix CVE-2025-23018, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-23018 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-23018 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-23018?
CVE-2025-23018 affects IETF IPv6.
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