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CVE-2021-21423

25
FAUCET Score

CVE-2021-21423 is a high-severity vulnerability affecting projen, a project generation tool. Specifically, it impacts users of projen's NodeProject type, allowing any GitHub user to trigger untrusted code execution within the main repository via the rebuild-bot workflow. This could potentially lead to unauthorized commits and access to repository secrets if branch protection is not enabled. The vulnerability has a CVSS score of 8.1 (HIGH), indicating a network-based attack with low complexity and high impact on confidentiality and integrity. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.6.0, < 0.16.41CPE matchmatch criteria
cpe:2.3:a:projen_project:projen:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

6.8MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
1.6
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.38%
Probability of exploitation in next 30 days
EPSS Percentile
69.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0138 is in the 66th percentile among its peer group of 17,844 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 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 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: projenFixed in: 0.16.41
pippatch availablevia ghsa
Product: projenFixed in: 0.16.41

Vendor Advisories (1)

npmGHSA-gg2g-m5wc-vccqhigh

Rebuild-bot workflow may allow unauthorised repository modifications

Apr 6, 2021

References

github.com / projen/projen/commit/36030c6a4b1acd0054673322612e7c70e9446643
PatchThird Party Advisory
github.com / projen/projen/security/advisories/GHSA-gg2g-m5wc-vccq
MitigationThird Party Advisory
npmjs.com / package/projen
ProductThird Party Advisory