How severe is CVE-2021-23421?

CVE-2021-23421 has a CVSS 3.x base score of 5.6, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2021-23421 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-23421?

CVE-2021-23421 affects Merge-change Project Merge-change. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-23421?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-23421 published?

CVE-2021-23421 was published on 2021-08-11 and last updated on 2026-06-17.

CVE-2021-23421

CVE-2021-23421 is a medium-severity vulnerability in Merge-change Project Merge-change with a CVSS 3.x base score of 5.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1321.

Key facts

Severity: Medium (CVSS 3.x base score 5.6)
CVSS v2: 7.5
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1321
Affected product: Merge-change Project Merge-change
Published: 2021-08-11
Last modified: 2026-06-17

Description

All versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.

Frequently asked questions

What is CVE-2021-23421?: All versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.
How severe is CVE-2021-23421?: CVE-2021-23421 has a CVSS 3.x base score of 5.6, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2021-23421 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23421?: CVE-2021-23421 affects Merge-change Project Merge-change. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-23421?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-23421 published?: CVE-2021-23421 was published on 2021-08-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:merge-change_project:merge-change:*:*:*:*:*:node.js:*:*

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