CVE-2021-23452

Name: CVE-2021-23452
Creator: NVD / NIST
Published: 2021-10-20T13:15:07.537+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.50%

Last modified Jun 17, 2026

CVE-2021-23452 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. This affects all versions of package x-assign. The global proto object can be polluted using the __proto__ object.. EPSS estimates a 1.50% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.50%

71.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1321

Affected Software

Vendor	Product	Versions
Binaryops	X-Assign	All versions

References

https://runkit.com/embed/sq8qjwemyn8tThird Party Advisory, URL Repurposed
https://snyk.io/vuln/SNYK-JS-XASSIGN-1759314Exploit, Third Party Advisory
https://runkit.com/embed/sq8qjwemyn8tThird Party Advisory, URL Repurposed
https://snyk.io/vuln/SNYK-JS-XASSIGN-1759314Exploit, Third Party Advisory

Timeline

Published: Oct 20, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23452?

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

How severe is CVE-2021-23452?

CVE-2021-23452 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.50% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23452?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-23452?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST