An embodiment may involve a plurality of configuration items and an unmatched configuration item, wherein the unmatched configuration item is associated with a first set of attribute values and a first vulnerability, wherein the first vulnerability is associated with a first set of field values. The embodiment may further involve one or more processors configured to: (i) determine that the unmatched configuration item and a particular configuration item both represent a specific component, wherein the particular configuration item is associated with a second set of attribute values and a second vulnerability, wherein the second vulnerability is associated with a second set of field values; (ii) merge the unmatched configuration item into the particular configuration item; (iii) determine that the first vulnerability and the second vulnerability both represent a specific vulnerability; (iv) merge the first vulnerability into the second vulnerability; and (v) delete the unmatched configuration item and the first vulnerability.