The red normally indicates overhang. In this case Cura thinks there is overhang in a vertical wall, which there isn't. It means that least the mesh has the wrong normals. CuraEngine does not look at the surface normals though, so this is not the issue directly. There is probably more wrong with your model than the normals.
If you check the X-Ray view, you will probably see red areas there (in the X-Ray view, red means there's an error in the mesh).
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gr5 2,230
I believe the red means you have an error in your model. Probably an internal duplicate wall. What CAD software did you use?
Here are tips for making sure your model is printable - the advice is sketchup oriented but most of the points apply to any CAD model (most cad software make it difficult to create unprintable models but sketchup makes it hard to create solid models):
https://i.materialise.com/blog/3d-printing-with-sketchup/
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