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CVE-2021-21429

15
FAUCET Score

CVE-2021-21429 is a low-severity vulnerability affecting OpenAPI Generator, where its Maven plugin creates insecure temporary files using File.createTempFile. This could expose application and system data to attacks, resulting in a potential loss of confidentiality. The CVSS score is 3.3 (LOW), indicating a local attack vector with low complexity and impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.1.0CPE matchmatch criteria
cpe:2.3:a:openapi-generator:openapi_generator:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.0MEDIUM

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.5
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.30%
Probability of exploitation in next 30 days
EPSS Percentile
21.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0030 is in the 68th percentile among its peer group of 1,511 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
mavenpatch availablevia ghsa
Product: org.openapitools:openapi-generator-maven-pluginFixed in: 5.1.0

Vendor Advisories (2)

mavenGHSA-867q-77cc-98mvmedium

Creation of Temporary File in Directory with Insecure Permissions in the OpenAPI Generator Maven plugin

Apr 29, 2021
redhatCVE-2021-21429Moderate

openapi-generator: Using File.createTempFile in JDK results in creating insecure temporary files

Apr 27, 2021

References

github.com / OpenAPITools/openapi-generator/pull/8795
PatchThird Party Advisory
github.com / OpenAPITools/openapi-generator/security/advisories/GHSA-867q-77cc-98mv
PatchThird Party Advisory