CVE-2025-23019
Cisco IPv6-in-IPv4 Tunneling Exposure Vulnerability
Description
IPv6-in-IPv4 tunneling (RFC 4213) allows an attacker to spoof and route traffic via an exposed network interface.
INFO
Published Date :
Jan. 14, 2025, 8:15 p.m.
Last Modified :
Jan. 29, 2025, 6:02 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Disable IPv6-in-IPv4 tunneling if not needed.
- Configure firewalls to drop spoofed IPv6 packets.
- Implement ingress filtering for IPv6 traffic.
Public PoC/Exploit Available at Github
CVE-2025-23019 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-23019.
| URL | Resource |
|---|---|
| https://datatracker.ietf.org/doc/html/rfc4213 | Technical Description |
| https://papers.mathyvanhoef.com/usenix2025-tunnels.pdf | Technical Description |
| https://www.top10vpn.com/research/tunneling-protocol-vulnerability/ | Technical Description |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-23019 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-23019
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-23019 vulnerability anywhere in the article.
-
CybersecurityNews
4M+ Internet-Exposed Systems at Risk From Tunneling Protocol Vulnerabilities
Researchers have uncovered critical security vulnerabilities affecting millions of computer servers and routers worldwide, stemming from the insecure implementation of fundamental internet tunneling p ... Read more
The following table lists the changes that have been made to the
CVE-2025-23019 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jan. 29, 2025
Action Type Old Value New Value Added CVSS V3.1 NIST AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L Added CWE NIST NVD-CWE-Other Added CPE Configuration OR *cpe:2.3:a:ietf:ipv6:-:*:*:*:*:*:*:* Changed Reference Type https://datatracker.ietf.org/doc/html/rfc4213 No Types Assigned https://datatracker.ietf.org/doc/html/rfc4213 Technical Description Changed Reference Type https://papers.mathyvanhoef.com/usenix2025-tunnels.pdf No Types Assigned https://papers.mathyvanhoef.com/usenix2025-tunnels.pdf Technical Description Changed Reference Type https://www.top10vpn.com/research/tunneling-protocol-vulnerability/ No Types Assigned https://www.top10vpn.com/research/tunneling-protocol-vulnerability/ Technical Description -
New CVE Received by [email protected]
Jan. 14, 2025
Action Type Old Value New Value Added Description IPv6-in-IPv4 tunneling (RFC 4213) allows an attacker to spoof and route traffic via an exposed network interface. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N Added CWE CWE-940 Added Reference https://datatracker.ietf.org/doc/html/rfc4213 Added Reference https://papers.mathyvanhoef.com/usenix2025-tunnels.pdf Added Reference https://www.top10vpn.com/research/tunneling-protocol-vulnerability/