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CVE-2021-21428

22
FAUCET Score

CVE-2021-21428 describes a vulnerability in openapi-generator and openapi-generator-online where insecure temporary folders are created during code generation, allowing local users to read and append to generated files. This flaw has a CVSS score of 7.0 (HIGH) due to its potential for high confidentiality, integrity, and availability impact through local, low-privileged attacks with high attack complexity. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion or media coverage 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

9.3CRITICAL

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.5
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.35%
Probability of exploitation in next 30 days
EPSS Percentile
27.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0035 is in the 65th percentile among its peer group of 1,525 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.4 InfoSec Media, 0.1 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-onlineFixed in: 5.1.0

Vendor Advisories (1)

mavenGHSA-23x4-m842-fmwfcritical

Creation of Temporary File in Directory with Insecure Permissions in the OpenAPI-Generator online generator

May 11, 2021

References

github.com / OpenAPITools/openapi-generator/pull/8788
PatchThird Party Advisory
github.com / OpenAPITools/openapi-generator/security/advisories/GHSA-23x4-m842-fmwf
ExploitThird Party Advisory