Catalyzes the oxidation of cucurbitadienol at the C-11 position to produce 11-oxo cucurbitadienol, a possible biosynthetic intermediate from cucurbitadienol to mogrol. cucurbitadienol + 2 O2 + 2 reduced [NADPH--hemoprotein reductase] = 11-oxocucurbitadienol + 2 H(+) + 3 H2O + 2 oxidized [NADPH--hemoprotein reductase] cucurbitadienol + O2 + reduced [NADPH--hemoprotein reductase] = 11-hydroxycucurbitadienol + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] 11-hydroxycucurbitadienol + O2 + reduced [NADPH--hemoprotein reductase] = 11-oxocucurbitadienol + H(+) + 2 H2O + oxidized [NADPH--hemoprotein reductase] Belongs to the cytochrome P450 family.