VRT 391,810 CVEs tracked · 15,472 in RASP scope · data as of 45 minutes ago

CVE-2021-21428

9.3 Critical No exploit published

Description

Openapi generator is a java tool which allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec. openapi-generator-online creates insecure temporary folders with File.createTempFile during the code generation process. The insecure temporary folders store the auto-generated files which can be read and appended to by any users on the system. The issue has been patched with Files.createTempFile and released in the v5.1.0 stable version.

CWE-269 · Improper privilege managementCWE-668CWE-377CWE-378CWE-379

Exploitation Status

No public exploit

Nothing published shows this CVE being exploited, which is not the same as ruling it out. nothing published in 5 years.

CVSS E:U

  • CISA KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC none indexed
  • EPSS 0.35% chance in 30 days

Waratek Defense Posture

No exploit published

In RASP's scope with an upstream fix path, but nobody has published a working exploit. That is a statement about what has been published, not a finding that the defect is unreachable or unimportant.

  • Protection none
  • Action unverified patch rule
  • Review automated upstream-data
  • Record active
Decided by no-exploit-published : A published working exploit for this candidate, not only a proof of concept, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV, CISA Vulnrichment records no active exploitation, and no reviewed exploit catalogue carries an entry for it. Nobody has published something a stranger can run, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.
Candidate fix https://github.com/OpenAPITools/openapi-generator/pull/8788 : a pull request: the change under review

CVSS

9.3 CRITICAL v3.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H 3 metrics

VRT selects the newest version's highest entry and publishes it as cvssScore, newest rather than largest because scores are not comparable across versions, and highest rather than first because the first entry is frequently a CNA placeholder scoring 0.0 over NVD's own analysis.

VersionScoreBandVectorAssignerType
CVSS 3.1 9.3 CRITICAL CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H security-advisories@github.com Secondary published
CVSS 3.1 7.0 HIGH CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H NVD Primary
CVSS 2.0 4.4 no band published AV:L/AC:M/Au:N/C:P/I:P/A:P NVD Primary

Affected Software & Releases

☕ Maven Library Packages

Artifact coordinates and fix boundaries from OSV.dev
Package CoordinateIntroducedFixedLast affected
org.openapitools:openapi-generator-online 0 5.1.0 unbounded

🖥️ Product CPEs & Version Ranges

2 product(s) over 2 version claims (uncapped)
SourceVendorProductSchemeAffected Versions
nvd openapi-generator openapi generator generic ＜ 5.1.0
osv org.openapitools openapi-generator-online generic ＜ 5.1.0

References

URLTags
https://github.com/OpenAPITools/openapi-generator/pull/8788 pr
https://github.com/OpenAPITools/openapi-generator/security/advisories/GHSA-23x4-m842-fmwf WEB
https://github.com/swagger-api/swagger-codegen/security/advisories/GHSA-pc22-3g76-gm6j WEB
https://github.com/OpenAPITools/openapi-generator PACKAGE
https://github.com/OpenAPITools/openapi-generator/blob/c6530519975341d7784a252132b2f0854f488901/modules/openapi-generator-online/src/main/java/org/openapitools/codegen/online/service/Generator.java#L184-L187 WEB

Timeline

Published 2021-05-10 Last modified 2026-06-17
Published2021-05-10By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.