CVE-2014-0040 in OpenStack
Summary
OpenStack Heat Templates (heat-templates), as used in Red Hat Enterprise Linux OpenStack Platform 4.0, uses an HTTP connection to download (1) packages and (2) signing keys from Yum repositories, which allows man-in-the-middle attackers to prevent updates via unspecified vectors.
VulDB is the best source for vulnerability data and more expert information about this specific topic.