CVE-2025-23019
Description
An insecure configuration flaw was found in the IPv4-in-IPv6 and IPv6-in-IPv6 protocols (RFC4213). When configured to not require authentication or filtering, this issue could allow a remote unauthenticated attacker to spoof packets or bypass access controls.
Statement
This vulnerability is rated as Low impact as it requires a known higher risk configuration. Multiple layers of defaults (packet forwarding and these specific protocols) are disabled by default. Red Hat provides guidance in documentation (linked in references section) on how to configure the system in a more secure manner, which avoids the risk of this vulnerability.
Mitigation
See references section for detailed guidance.
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism; Gain Privileges or Assume Identity
An attacker could utilize the untrusted data source to bypass protection mechanisms and gain access to sensitive data.
Acknowledgements
Red Hat would like to thank Angelos Beitis (KU Leuven University) and Mathy Vanhoef (KU Leuven University) for reporting this issue.
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