Someone could easily throw a long chain ladder or double rope ladder over that and climb up and then down the other side.
That design needs to be topped with razor wire to be effective.
...... I bet the US Special Forces wished they had tried that tactic when they attempted to scale the prototype wall. Some things look a lot easier on paper than in reality. That said .... Razor wire on the top would actually be a great touch and make it even more formidable.