Molecular function

L-ascorbate-cytochrome-b5 reductase activity, L-ascorbate:ferricytochrome-b5 oxidoreductase activity, ascorbate-cytochrome b5 reductase activity

Oxidation of Fe(3+) to Fe(2+) on the outer side of a membrane coupled to the reduction of L-ascorbate to monodehydro-L-ascorbate radical on the inner side of a membrane. Electrons get transferred across the membrane during the reaction.