What is CVE-2021-23442?

CVE-2021-23442 is a high-severity vulnerability in Cookiex-Deep Project, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 8.6/10. Published 2021-09-17.

How severe is CVE-2021-23442?

High severity. CVSS v3 base score is 8.6 out of 10.

Prototype Pollution in Cookiex-Deep Project

CVE-2021-23442

This affects all versions of package @cookiex/deep. The global proto object can be polluted using the __proto__ object.

Vulnerability class: Prototype Pollution

Published 2021-09-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L.

EPSS exploit prediction

EPSS: 0.016 (75.5th percentile), scored 2026-10-24.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 75.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Cookiex-Deep Project
@Cookiex/deep — versions 0

Weakness classification (CWE)

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

References

snyk.io/vuln/SNYK-JS-COOKIEXDEEP-1582793 (Exploit, Patch, Third Party Advisory)
github.com/tony-tsx/cookiex-deep/issues/1 (Patch, Third Party Advisory, Issue Tracking)
github.com/tony-tsx/cookiex-deep/commit/b5bea2b7f34a5fa9abb4446cbd038ecdbcd09c88 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-23442?: CVE-2021-23442 is a high-severity vulnerability in Cookiex-Deep Project, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 8.6/10. Published 2021-09-17.
How severe is CVE-2021-23442?: High severity. CVSS v3 base score is 8.6 out of 10.