While viewing wildlife there is a degree of danger as the behavior of wild animals cannot be guaranteed. However most animals are frightened by the sight / smell of humans and rather than attack, will flee (unless cornered or provoked). Attacks on humans are rare.
While on safari you will be accompanied by a SLA guides who are well trained & armed with an amazing understanding of the wildlife with which they share their lives on a daily basis.

At your tented camp or lodge it is not uncommon for wildlife to wander through as camps & lodges are typically not fenced. An attack on a sleeping traveler would be highly unusual. However please never venture outside your accommodation at night without your guide. Always consult with your guide/s when in doubt.