Converts 11-deoxycorticosterone into corticosterone, 18-hydroxycorticosterone, and aldosterone. Can also catalyze the conversion of 11-deoxycortisol to cortisol, 18-hydroxycortisol and cortisone. a steroid + 2 H(+) + O2 + 2 reduced [adrenodoxin] = an 11beta-hydroxysteroid + H2O + 2 oxidized [adrenodoxin] corticosterone + 2 H(+) + O2 + 2 reduced [adrenodoxin] = 18-hydroxycorticosterone + H2O + 2 oxidized [adrenodoxin] Adrenal cortex. Belongs to the cytochrome P450 family.