$ echo "ABC;123;;;;;HELLO;
DEF;345;;BANANA;12DEF;44,55;4*12;;;;;;;;3;" | perl -lpe's/;\K([^;]*)/"$1"/g'
ABC;"123";"";"";"";"";"HELLO";""
DEF;"345";"";"BANANA";"12DEF";"44,55";"4*12";"";"";"";"";"";"";"";"3";""