We propose a glass model of vortex pinning in highly disordered thin superconducting films in magnetic fields B << H_{c2} at low temperatures. The method we use is similar to one developed in paper by Mueller and Ioffe (2004) for «Coulomb glass» in the Efros-Shklovskii model of coulomb gap. The glass state is described in the 1-step replica symmetry breaking scheme, which appears to be quite a good approximation (albeit, strictly speaking, unstable), with the numerical small parameter controlling this approximation having the order 10^{-5}. The distribution of local vortex energies P(h) is gapped with the same accuracy, which leads to a non-zero superfluid stiffness (finite kinetic inductance) in the film subject to strong magnetic field.