CNN was a news broadcasting television network.
In 2259 of the alternate reality, footage from this network showing Starfleet personnel was in a collection of graphics and video media that were seen on a large powerwall in the offices of Christopher Pike and Alexander Marcus at Starfleet Headquarters. (Star Trek Into Darkness)
The CNN logo can be seen in the video "Star Trek: Into Darkness – User Interface VFX" at vimeo.com. [1]
The powerwall interface was created by motion graphic artist Blaise Kyle Hossain at visual effects company OOOii.