Out of a scale of 100, Zimbabwe is rated at 53, from a measurement where zero is the most-free country to 100, being the least free country on Internet freedom.
Zambia scored 42; Angola (40); Malawi (39) and South Africa (25).
The index measures obstacles to Internet access, limits on content and violations of user rights.
The Misa report singles out January's draconian Internet blackout in Zimbabwe.
"While the ban was lifted on Wednesday 16 January 2019, leaving only a ban on social media platforms, another full Internet shutdown was ordered on Thursday 17 January 2019, effectively leaving a majority of Zimbabweans without access to the Internet…" reads the report.