What is CVE-2021-4295?

CVE-2021-4295 is a medium-severity vulnerability in Healthit Code-Validator-Api, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 5.5/10. Published 2022-12-29.

How severe is CVE-2021-4295?

Medium severity. CVSS v3 base score is 5.5 out of 10.

XXE in Healthit Code-Validator-Api

CVE-2021-4295

A vulnerability classified as problematic was found in ONC code-validator-api up to 1.0.30. This vulnerability affects the function vocabularyValidationConfigurations of the file src/main/java/org/sitenv/vocabularies/configuration/CodeValidatorApiConfiguration.java of the component XML Handler. The manipulation leads to xml external entity reference. Upgrading to version 1.0.31 is able to address this issue. The name of the patch is fbd8ea121755a2d3d116b13f235bc8b61d8449af. It is recommended to upgrade the affected component. VDB-217018 is the identifier assigned to this vulnerability.

Vulnerability class: XXE (XML External Entity)

Published 2022-12-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.007 (52.2th percentile), scored 2026-10-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Healthit Code-Validator-Api
Onc Code-Validator-Api — versions 1.0.0, 1.0.1, 1.0.2

Weakness classification (CWE)

CWE-611 — Improper Restriction of XML External Entity Reference (XXE)

References

vuldb.com/ (technical-description, Third Party Advisory, vdb-entry)
vuldb.com/ (signature, permissions-required, Third Party Advisory)
github.com/onc-healthit/code-validator-api/pull/97 (issue-tracking, Third Party Advisory)
github.com/onc-healthit/code-validator-api/commit/fbd8ea121755a2d3d116b13f235bc… (Patch, Third Party Advisory, patch)
github.com/onc-healthit/code-validator-api/releases/tag/1.0.31 (Third Party Advisory, patch)

Frequently asked questions

What is CVE-2021-4295?: CVE-2021-4295 is a medium-severity vulnerability in Healthit Code-Validator-Api, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 5.5/10. Published 2022-12-29.
How severe is CVE-2021-4295?: Medium severity. CVSS v3 base score is 5.5 out of 10.