JPA Server in HAPI FHIR before 5.4.0 allows a user to deny service (e.g., disable access to the database after the attack stops) via history requests. This occurs because of a SELECT COUNT statement that requires a full index scan, with an accompanying large amount of server resources if there are many simultaneous history requests.
{ "nvd_published_at": "2021-05-10T21:15:00Z", "github_reviewed_at": "2021-05-19T19:47:05Z", "severity": "MODERATE", "github_reviewed": true, "cwe_ids": [ "CWE-400" ] }