CVE-2021-21413: isolated-vm is a library for nodejs which gives you access to v8's Isolate interface

This month

HIGH 8.0UPGRADE

CVE-2021-21413 is a high-severity flaw (CVSS 8.0) affecting isolated-vm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

isolated-vm is a library for nodejs which gives you access to v8's Isolate interface. Versions of isolated-vm before v4.0.0 have API pitfalls which may make it easy for implementers to expose supposed secure isolates to the permissions of the main nodejs isolate. Reference objects allow access to the underlying reference's full prototype chain. In an environment where the implementer has exposed a Reference instance to an attacker they would be a

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.0 (High)
Attack vector	Adjacent network
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-913
Published	2021-03-30
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: isolated-vm project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-03-30 23:15 UTCPublished CVE record published
2026-06-17 03:35 UTCUpdated Record last modified

isolated-vm project isolated-vm UPGRADE

Affected: < 4.0.0

Fixed in: 4.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls isolated-vm

2. UPGRADE to 4.0.0

npm install isolated-vm@">=4.0.0"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-21413?

isolated-vm: upgrade to 4.0.0. Exact commands for each OS are on this page.

Is CVE-2021-21413 being exploited?

CVE-2021-21413 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-21413 affect?

CVE-2021-21413 affects isolated-vm. Severity is high (CVSS 8.0). isolated-vm is a library for nodejs which gives you access to v8's Isolate interface. Versions of isolated-vm before v4.0.0 have API pitfalls which may make it easy for implementers to expose supposed secure isolates to the permissions of t

How urgent is CVE-2021-21413?

Priority 41/100. High severity

Software pages

Node.js vulnerabilities

Related CVEs

CVE-2022-39266 CRITICAL 9.6 UPGRADE isolated-vm is a library for nodejs which gives the user access to v8's Isolate interface

References

← Back to latest CVEs