What is CVE-2021-23452?

CVE-2021-23452 is a high-severity vulnerability in Binaryops X-Assign, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 8.6/10. Published 2021-10-20.

How severe is CVE-2021-23452?

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

Prototype Pollution in Binaryops X-Assign

CVE-2021-23452

This affects all versions of package x-assign. The global proto object can be polluted using the __proto__ object.

Vulnerability class: Prototype Pollution

Published 2021-10-20 · 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: 0.015 (74.9th percentile), scored 2026-10-24.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Binaryops X-Assign
X-Assign — versions 0

Weakness classification (CWE)

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

References

snyk.io/vuln/SNYK-JS-XASSIGN-1759314 (Exploit, Third Party Advisory)
runkit.com/embed/sq8qjwemyn8t (URL Repurposed, Third Party Advisory)

Frequently asked questions

What is CVE-2021-23452?: CVE-2021-23452 is a high-severity vulnerability in Binaryops X-Assign, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 8.6/10. Published 2021-10-20.
How severe is CVE-2021-23452?: High severity. CVSS v3 base score is 8.6 out of 10.