CVE-2021-23470

Name: CVE-2021-23470
Creator: NVD / NIST
Published: 2022-02-04T20:15:08.363+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.25%

Last modified Jun 17, 2026

CVE-2021-23470 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. This affects the package putil-merge before 3.8.0. The merge() function does not check the values passed into the argument. EPSS estimates a 1.25% chance of exploitation in the next 30 days.

Description

This affects the package putil-merge before 3.8.0. The merge() function does not check the values passed into the argument. An attacker can supply a malicious value by adjusting the value to include the constructor property. Note: This vulnerability derives from an incomplete fix in https://security.snyk.io/vuln/SNYK-JS-PUTILMERGE-1317077

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

1.25%

65.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1321

Affected Software

Vendor	Product	Versions
Putil-Merge Project	Putil-Merge	< 3.8.0

References

https://github.com/panates/putil-merge/commit/476d00078dfb2827d7c9ee0f2392c81b864f7bc5Patch, Third Party Advisory
https://snyk.io/vuln/SNYK-JS-PUTILMERGE-2391487Exploit, Vendor Advisory
https://github.com/panates/putil-merge/commit/476d00078dfb2827d7c9ee0f2392c81b864f7bc5Patch, Third Party Advisory
https://snyk.io/vuln/SNYK-JS-PUTILMERGE-2391487Exploit, Vendor Advisory

Timeline

Published: Feb 4, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23470?

How severe is CVE-2021-23470?

CVE-2021-23470 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.25% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23470?

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-2021-23470?

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

Scan your code now

Source: NVD / NIST