Improper verification of communication channel in IETF IPv6
Priority LOW 31CWE-940Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01025 63rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2025-23018
- 2026-10-03 Alias added: GHSA-mf23-wm84-g9x3
References
More IETF Ipv6 vulnerabilities
- TI-2016-08218 An issue was discovered in the IPv6 protocol specification, related to ICMP Packet Too… CVSS 3.0HIGH 8.6
- TI-2007-02160 The IPv6 protocol allows remote attackers to cause a denial of service via crafted IPv6… CVSS 2.0HIGH 7.8
- TI-2025-16831 IPv6-in-IPv4 tunneling (RFC 4213) allows an attacker to spoof and route traffic via an exposed network interface. CVSS 3.1MEDIUM 6.5
Sources
- CVE-2025-23018 · CVE Program
- CVE-2025-23018 · NVD
- FIRST EPSS
- GHSA-mf23-wm84-g9x3 · GitHub Advisory Database · CC BY 4.0
- CVE-2025-23018 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences