CVE-2025-23019: IPv6-in-IPv4 tunneling (RFC 4213) allows an attacker to spoof and route traffic via an exposed network interfa

This month

MEDIUM 5.4REMOTEMITIGATE

CVE-2025-23019 is a medium-severity flaw (CVSS 5.4) affecting ipv6. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IPv6-in-IPv4 tunneling (RFC 4213) allows an attacker to spoof and route traffic via an exposed network interface.

Why this priority

Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-940
Published	2025-01-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ietf

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-01-14 20:15 UTCPublished CVE record published
2026-06-17 08:51 UTCUpdated Record last modified

ietf ipv6 MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ipv6 || rpm -q ipv6 || ipv6 --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-23019?

ipv6: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-23019 being exploited?

CVE-2025-23019 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-23019 affect?

CVE-2025-23019 affects ipv6. Severity is medium (CVSS 5.4). IPv6-in-IPv4 tunneling (RFC 4213) allows an attacker to spoof and route traffic via an exposed network interface.

How urgent is CVE-2025-23019?

Priority 40/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-23018 MEDIUM 5.4 MITIGATE IPv4-in-IPv6 and IPv6-in-IPv6 tunneling (RFC 2473) do not require the validation or verification of the source

References

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