What’s Vulnerable › Vulnerabilities

CVE-2025-23018

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-01-14 · updated 2026-06-17
• Weakness: CWE-940

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.

Affected products

• IETF IPv6: all versions

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

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