CVE-2021-21429

MEDIUMNVD 4.04.0—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.0 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 78% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
4.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.0Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

OpenAPI Generator allows generation of API client libraries, server stubs, documentation and configuration automatically given an OpenAPI Spec. Using File.createTempFile in JDK will result in creating and using insecure temporary files that can leave application and system data vulnerable to attacks. OpenAPI Generator maven plug-in creates insecure temporary files during the process. The issue has been patched with Files.createTempFile and released in the v5.1.0 stable version.

CVSS v3
4.0
EG Score
4.0(medium)
EG Risk
—
EPSS
21.7%
KEV
Not listed

Published

April 27, 2021

Last Modified

November 21, 2024

References (4)

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
org.openapitools:openapi-generator-maven-plugin3.0.0 ... 5.0.1 (38 versions)5.1.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 101 total refreshes for this CVE.

  1. 2026-07-22 22:43 UTCEG score recompute
  2. 2026-07-22 14:05 UTCEPSS rescore
  3. 2026-07-21 15:22 UTCEPSS rescore
  4. 2026-07-21 15:22 UTCEPSS rescore
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  8. 2026-07-18 21:29 UTCOSV refresh
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  8. 2026-07-01 04:18 UTCOSV refresh
  9. 2026-06-30 23:20 UTCEPSS rescore
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  39. 2026-06-13 07:13 UTCOSV refresh
  40. 2026-06-12 23:10 UTCEPSS rescore
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  42. 2026-06-11 13:58 UTCEPSS rescore
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  72. 2026-05-26 13:42 UTCEPSS rescore
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  74. 2026-05-26 07:17 UTCEPSS rescore
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Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-21429?
CVE-2021-21429 is a medium vulnerability published on April 27, 2021. OpenAPI Generator allows generation of API client libraries, server stubs, documentation and configuration automatically given an OpenAPI Spec. Using File.createTempFile in JDK will result in creating and using insecure temporary files that can leave application and system data vulnerable to…
When was CVE-2021-21429 disclosed?
CVE-2021-21429 was first published in the National Vulnerability Database on April 27, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-21429 actively exploited?
CVE-2021-21429 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 21.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-21429?
CVE-2021-21429 has a CVSS v3 base score of 4.0 (NVD).
How do I remediate CVE-2021-21429?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-21429, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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