Maalim's endless gaffe gifted Burundi with three soft goals to put the game beyond their reach and a spot-kick converted by Hassan Mohamed in the 50th minute could not help revive their fortunes.
Burundi took command of the game with skipper Selemane Nduikamana and forward Christopher Nduwaragira all grabbing a brace while Yusuf Ndaikumna scored through a powerful volley from 25 yards to register the big victory.
Nduwaragira shook the net in the 34th and 87th minutes respectively tapping in from the box after Somalia’s shot stopper Maalim had spilled the ball in the two occasions.
It was also a good evening for Nduikamana as he scored twice in an interval of five minutes in the 78th and 83rd minutes.
The win puts Burundi in a strong command for a quarter-finals berth as they just need one win from the remaining two matches to sail through.
Somalia had began the match on a high note firing the first salvo in the eighth minute when Abdikadir Mohamed headed a corner-kick narrowly above Burundi's cross bar with their shot stopper Said Nduwimana well beaten.
The opposition, however, did not sit back but launched a quick counter attack when Osman Ali fired powerfully but his shot forced Maaalim to make a daring save.
The second half was a one way traffic with Somalia being reduced to mere shadow chasers as Burundi made inroads in their own half.
With a week defense crumbling, Maalim was in many instances left exposed making it easy for Burundi to score at will.