Insecure Implementation of Tunneling Protocols (GRE/IPIP/4in6/6in4) - Researchers at the DistriNet-KU Leuven research group have discovered millions of vulnerable Internet systems that accept unauthenticated IPIP, GRE, 4in6, or 6in4 traffic. This can be considered a generalization of the vulnerability in VU#636397

https://www.kb.cert.org/vuls/id/199397

#vulnerability #network #tunneling #gre #ipip #4in6 #6in4