CVE-2021-32053

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-05-10 · updated 2026-06-17
Weakness: CWE-400

Description

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.

Affected products

FHIR Hapi Fhir: before 5.4.0 — fixed in 5.4.0

How to fix

Upgrade to a fixed version: FHIR Hapi Fhir 5.4.0. Check the vendor advisory for mitigations.

References

https://github.com/hapifhir/hapi-fhir/issues/2641
https://github.com/hapifhir/hapi-fhir/pull/2642
https://hapifhir.io
https://github.com/hapifhir/hapi-fhir/issues/2641
https://github.com/hapifhir/hapi-fhir/pull/2642
https://hapifhir.io

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