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CVE-2021-4264

28
FAUCET Score

CVE-2021-4264 is a high-severity prototype pollution vulnerability affecting LinkedIn's dustjs library up to version 2.x. This flaw allows for improperly controlled modification of object prototype attributes, potentially leading to significant impact on confidentiality, integrity, and availability. The vulnerability can be exploited remotely with low attack complexity, and public exploit code is available. While there is no evidence of active exploitation, upgrading to dustjs version 3.0.0 is recommended to mitigate this risk.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.0.0CPE matchmatch criteria
cpe:2.3:a:linkedin:dustjs:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
2.8
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.07%
Probability of exploitation in next 30 days
EPSS Percentile
61.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0107 is in the 58th percentile among its peer group of 17,808 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 (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: dustjs-linkedinFixed in: 3.0.0

Vendor Advisories (1)

npmGHSA-c6rp-wrp9-qr4qhigh

dustjs-linkedin vulnerable to Prototype Pollution

Dec 21, 2022

References

github.com / linkedin/dustjs/commit/ddb6523832465d38c9d80189e9de60519ac307c3
PatchThird Party Advisory
github.com / linkedin/dustjs/issues/804
ExploitIssue TrackingThird Party Advisory
github.com / linkedin/dustjs/pull/805
ExploitIssue TrackingPatchThird Party Advisory
github.com / linkedin/dustjs/releases/tag/v3.0.0
Release NotesThird Party Advisory
vuldb.com
VDB Entry
vuldb.com
Third Party AdvisoryVDB Entry