CMC builds are a stripped version of the Junos OS. While new junos releases are issued periodically, cmc builds of junos are only released when a code change is required. Once it was discovered CMC need to be fixed, it was decided to use the latest build at the time which was R12. In regards to CMC, this was released to resolve the vulnerability. While there were other codes to junos between R11 and R12, these are not relative to CMC.
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