Converts salicylic acid (SA) to 2,3-dihydroxybenzoic acid (2,3-DHBA) (By similarity). Negative regulator of defense against Hyaloperonospora arabidopsidis (PubMed:25376907). (Microbial infection) Confers susceptibility to the downy mildew pathogen Hyaloperonospora arabidopsidis. H(+) + NADH + O2 + salicylate = 2,3-dihydroxybenzoate + H2O + NAD(+) Binds 1 Fe(2+) ion per subunit. Belongs to the iron/ascorbate-dependent oxidoreductase family.