  The problem of scattering of CMB radiation on wormholes is considered. It is
shown that a static gas of wormholes does not perturb the spectrum of CMB. In
the first order by $v/c$ the presence of peculiar velocities gives rise to the
dipole contribution in $\Delta T/T$, which corresponds to the well-known
kinetic Sunyaev-Zel'dovich effect. In next orders there appears a more
complicated dependence of the perturbed CMB spectrum on peculiar velocities. We
also discuss some peculiar features of the scattering on a single wormhole.
