How severe is CVE-2021-23594?

CVE-2021-23594 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-23594 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-23594?

CVE-2021-23594 affects Agoric Realms-shim. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-23594?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-23594 published?

CVE-2021-23594 was published on 2022-01-10 and last updated on 2026-06-17.

CVE-2021-23594

CVE-2021-23594 is a critical-severity vulnerability in Agoric Realms-shim with a CVSS 3.x base score of 9.8. 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: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1321
Affected product: Agoric Realms-shim
Published: 2022-01-10
Last modified: 2026-06-17

Description

All versions of package realms-shim are vulnerable to Sandbox Bypass via a Prototype Pollution attack vector.

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.
How severe is CVE-2021-23594?: CVE-2021-23594 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-23594 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23594?: CVE-2021-23594 affects Agoric Realms-shim. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-23594?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-23594 published?: CVE-2021-23594 was published on 2022-01-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:agoric:realms-shim:*:*:*:*:*:node.js:*:*

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CVE-2021-23543 — Critical (CVSS 9.8): All versions of package realms-shim are vulnerable to Sandbox Bypass via a Prototype Pollution attack vector.

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