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CVE-2021-4278

25
FAUCET Score

CVE-2021-4278 is a prototype pollution vulnerability affecting cronvel tree-kit versions up to 0.6.x, allowing for improperly controlled modification of object prototype attributes. With a CVSS score of 7.8 (HIGH), it presents a significant risk with local attack vector, low complexity, and high impact on confidentiality, integrity, and availability. There is no evidence of active exploitation, public exploit code, or significant community discussion, suggesting it is not currently a widespread threat. Upgrading to tree-kit version 0.7.0 is recommended to remediate this issue.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.7.0CPE matchmatch criteria
cpe:2.3:a:tree_kit_project:tree_kit:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

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

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
2.1
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.43%
Probability of exploitation in next 30 days
EPSS Percentile
35.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0043 is in the 75th percentile among its peer group of 16,994 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 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 0.3 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
npmpatch availablevia ghsa
Product: tree-kitFixed in: 0.7.0

Vendor Advisories (1)

npmGHSA-mw4x-g2x8-qcvfhigh

tree-kit vulnerable to Prototype Pollution

Dec 25, 2022

References

github.com / cronvel/tree-kit/commit/a63f559c50d70e8cb2eaae670dec25d1dbc4afcd
PatchThird Party Advisory
github.com / cronvel/tree-kit/releases/tag/v0.7.0
Release NotesThird Party Advisory
vuldb.com
Third Party Advisory
vuldb.com
Third Party Advisory