[Amnesia:33](https://www.forescout.com/company/resources/amnesia33-how-tcp-ip-stacks-breed-critical-vulnerabilities-in-iot-ot-and-it-devices/) is a group of 33 vulnerabilities in open-source TCP/IP stack libraries. The vulnerabilities may be present in a wide range of operational technology, IoT, and connected device implementations.

An issue was discovered in the IPv6 stack in Contiki through 3.0. There are inconsistent checks for IPv6 header extension lengths. This leads to Denial-of-Service and potential Remote Code Execution via a crafted ICMPv6 echo packet.