CVE-2021-23421
CVSS v3
9.8
CRITICAL
EPSS Score
1.1 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
All versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.
Technical details
- Published
- 2021-08-11
Frequently asked questions
What is CVE-2021-23421?
All versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.
Is CVE-2021-23421 actively exploited?
Active exploitation of CVE-2021-23421 has not been confirmed. Its EPSS score was 1.1% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-23421?
CVE-2021-23421 has a CVSS v3 base score of 9.8 (CRITICAL severity).
Is CVE-2021-23421 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.
No credit card required · 500 free checks/month · Free API key
Other 2021 vulnerabilities worth triaging
Ranked by exploit probability (EPSS).