The IETF has published RFC 6274, entitled “Security Assessment of the Internet Protocol Version 4”, which is an IETF version of the IPv4 security assessment that had been published by CPNI in 2008. The Abstract of the RFC is:
This document contains a security assessment of the IETF
specifications of the Internet Protocol version 4 and of a number of
mechanisms and policies in use by popular IPv4 implementations. It
is based on the results of a project carried out by the UK’s Centre
for the Protection of National Infrastructure (CPNI).
The RFC is available here.
