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We present the analysis of a microlensing event reported by the <jats:italic>Gaia<\/jats:italic> photometric alert team that might have a bright lens.<\/jats:p>\n<jats:p><jats:italic>Aims<\/jats:italic>. In order to infer the mass and distance to the lensing system, the parallax measurement at the position of Gaia21blx was used. In this particular case, the source and the lens have comparable magnitudes and we cannot attribute the parallax measured by <jats:italic>Gaia<\/jats:italic> to the lens or source alone.<\/jats:p>\n<jats:p><jats:italic>Methods<\/jats:italic>. Since the blending flux is important, we assumed that the <jats:italic>Gaia<\/jats:italic> parallax is the flux-weighted average of the parallaxes of the lens and source. Combining this assumption with the information from the microlensing models and the finite source effects we were able to resolve all degeneracies and thus obtained the mass, distance, luminosities and projected kinematics of the binary lens and the source.<\/jats:p>\n<jats:p><jats:italic>Results<\/jats:italic>. According to the best model, the lens is a binary system at 2.18 \u00b1 0.07 kpc from Earth. It is composed of a G star with 0.95 \u00b1 0.17 <jats:italic>M<\/jats:italic><jats:sub>\u2299<\/jats:sub> and a K star with 0.53 \u00b1 0.07 <jats:italic>M<\/jats:italic><jats:sub>\u2299<\/jats:sub>. The source is likely to be an F subgiant star at 2.38 \u00b1 1.71 kpc with a mass of 1.10 \u00b1 0.18 <jats:italic>M<\/jats:italic><jats:sub>\u2299<\/jats:sub>. Both lenses and the source follow the kinematics of the thin-disk population. 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