Hydrolyzes RNA 2',3'-cyclic phosphodiester to an RNA 2'-phosphomonoester. a 3'-end 2',3'-cyclophospho-ribonucleotide-RNA + H2O = a 3'-end 2'-phospho-ribonucleotide-RNA + H(+) Belongs to the 2H phosphoesterase superfamily. ThpR family.