There are plenty of standards already in place, and under construction, for sharing cyber threats and cyber attacks, but as they say, "That's the great thing about standards, there are so many to choose from." As usual here at OMG, we hate to add to the confusion with yet-another-standard, with the potential to create just the N+1th standard.
Last week at the OMG Technical Meeting in Santa Clara, CA, USA, Gerald Beuchelt of Demandware, Inc, made a presentation to the Systems Assurance Task Force on Threat Modeling. Threat Modeling, at the abstract level of UML, will enable system engineers and architects to actually build systems of systems that effectively share threats (and potentially actual attacks) across different systems and standards.
Gerald discussed his presentation on his blog (which you can read here). This effort has been creating enormous interest among the OMG membership, as well as a host of other organizations (including military/aerospace vendors, government agencies, retail organizations and many others). Keep an eye out for more Threat Modeling activities at OMG, part of the Systems Assurance Platform Task Force.