CVE-2021-23594
CVSS v3
10
CRITICAL
EPSS Score
1.8 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
All versions of package realms-shim are vulnerable to Sandbox Bypass via a Prototype Pollution attack vector.
Technical details
- Published
- 2022-01-10
Frequently asked questions
What is CVE-2021-23594?
All versions of package realms-shim are vulnerable to Sandbox Bypass via a Prototype Pollution attack vector.
Is CVE-2021-23594 actively exploited?
Active exploitation of CVE-2021-23594 has not been confirmed. Its EPSS score was 1.8% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-23594?
CVE-2021-23594 has a CVSS v3 base score of 10 (CRITICAL severity).
Is CVE-2021-23594 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).