What is CVE-2021-4264?

CVE-2021-4264 is a medium-severity vulnerability in Linkedin Dustjs, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 6.3/10. Published 2022-12-21.

How severe is CVE-2021-4264?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Prototype Pollution in Linkedin Dustjs

CVE-2021-4264

A vulnerability was found in LinkedIn dustjs up to 2.x and classified as problematic. Affected by this issue is some unknown functionality. The manipulation leads to improperly controlled modification of object prototype attributes ('prototype pollution'). The attack may be launched remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 3.0.0 is able to address this issue. The name of the patch is ddb6523832465d38c9d80189e9de60519ac307c3. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-216464.

Vulnerability class: Prototype Pollution

Published 2022-12-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.011 (63.7th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 63.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Linkedin Dustjs — versions 2.x

Weakness classification (CWE)

CWE-1321 — Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution)

References

vuldb.com/ (VDB Entry, Third Party Advisory, vdb-entry)
vuldb.com/ (signature, permissions-required, VDB Entry)
github.com/linkedin/dustjs/issues/804 (issue-tracking, Exploit, Third Party Advisory, exploit, Issue Tracking)
github.com/linkedin/dustjs/pull/805 (issue-tracking, Exploit, Patch, Third Party Advisory, Issue Tracking)
github.com/linkedin/dustjs/commit/ddb6523832465d38c9d80189e9de60519ac307c3 (Patch, Third Party Advisory, patch)
github.com/linkedin/dustjs/releases/tag/v3.0.0 (Third Party Advisory, Release Notes, patch)

Frequently asked questions

What is CVE-2021-4264?: CVE-2021-4264 is a medium-severity vulnerability in Linkedin Dustjs, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 6.3/10. Published 2022-12-21.
How severe is CVE-2021-4264?: Medium severity. CVSS v3 base score is 6.3 out of 10.