VulnerabilityModified
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.
MEDIUM 6.5EPSS 1.05%
Does this matter?
Lower severity and a low EPSS score (1.05%). Track it; it rarely justifies an emergency change on its own.
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
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
- EPSS
- 1.05% probability · 62th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-940
- Affected
- ietf/ipv6
- Source
- cve@mitre.org
References
- https://datatracker.ietf.org/doc/html/rfc2473Technical 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.