CVE-2021-21413

HIGHNVD 8.08.0—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.0 under NVD CVSS v3. EPSS exploit probability: 0.7% (52nd percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
8.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 8.0Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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 able to use it to acquire a Reference to the nodejs context's Function object. Similar application-specific attacks could be possible by modifying the local prototype of other API objects. Access to NativeModule objects could allow an attacker to load and run native code from anywhere on the filesystem. If combined with, for example, a file upload API this would allow for arbitrary code execution. This is addressed in v4.0.0 through a series of related changes.

CVSS v3
8.0
EG Score
8.0HIGHmedium confidence
EG Risk
41
EG Risk 41/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity80% × 45%
Exploitation1% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.7%
EPSS %ILE
52nd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

March 30, 2021

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Sep 20, 2026
Patch available. Sources: github_commit, github.
githubMentions a patch (unverified)

Misuse of `Reference` and other transferable APIs may lead to access to nodejs isolate · Advisory · laverdet/isolated-vm · GitHub

https://github.com/laverdet/isolated-vm/security/advisories/GHSA-mmhj-4w6j-76h7
github_commit Patch Available

commit 27151bfecc26 (laverdet/isolated-vm)

Patch available: laverdet/isolated-vm v4.6.0 (contains commit 27151bfecc26)

https://github.com/laverdet/isolated-vm/commit/27151bfecc260e96714443613880e3b2e6596704
github_commit Patch Available

commit 2646e6c1558b (laverdet/isolated-vm)

Patch available: laverdet/isolated-vm v4.6.0 (contains commit 2646e6c1558b)

https://github.com/laverdet/isolated-vm/commit/2646e6c1558bac66285daeab54c7d490ed332b15
generic

isolated-vm/CHANGELOG.md at main · laverdet/isolated-vm · GitHub

https://github.com/laverdet/isolated-vm/blob/main/CHANGELOG.md#v400

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
isolated-vm—
  • every version up to 4.0.0: fixed in 4.0.0
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 33× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 183 total refreshes for this CVE.

  1. 2026-10-09 20:04 UTCEPSS rescore
  2. 2026-10-08 16:39 UTCEPSS rescore
  3. 2026-10-07 23:44 UTCEPSS rescore
  4. 2026-10-06 15:13 UTCEPSS rescore
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  9. 2026-10-02 16:22 UTCEPSS rescore
  10. 2026-10-01 19:46 UTCEPSS rescore
  11. 2026-09-30 15:29 UTCEG score recompute
  12. 2026-09-30 15:00 UTCEPSS rescore
  13. 2026-09-28 13:47 UTCEPSS rescore
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  15. 2026-09-26 15:54 UTCEPSS rescore
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  17. 2026-09-26 04:55 UTCOSV refresh
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  1. 2026-09-17 19:23 UTCEPSS rescore
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  5. 2026-09-13 16:43 UTCEPSS rescore
  6. 2026-09-12 14:57 UTCEPSS rescore
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  9. 2026-09-08 21:56 UTCEPSS rescore
  10. 2026-09-07 15:58 UTCEPSS rescore
  11. 2026-09-06 20:01 UTCOSV refresh
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  22. 2026-08-28 21:37 UTCEPSS rescore
  23. 2026-08-27 14:22 UTCEPSS rescore
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  25. 2026-08-25 13:45 UTCEPSS rescore
  26. 2026-08-23 00:16 UTCEPSS rescore
  27. 2026-08-21 23:46 UTCEPSS rescore
  28. 2026-08-20 22:52 UTCEPSS rescore
  29. 2026-08-20 06:04 UTCOSV refresh
  30. 2026-08-19 17:01 UTCEPSS rescore
  31. 2026-08-18 13:45 UTCEPSS rescore
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  36. 2026-08-13 21:57 UTCEPSS rescore
  37. 2026-08-12 13:47 UTCEPSS rescore
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  39. 2026-08-09 13:43 UTCEPSS rescore
  40. 2026-08-08 16:33 UTCEPSS rescore
  41. 2026-08-07 16:23 UTCEPSS rescore
  42. 2026-08-06 13:43 UTCEPSS rescore
  43. 2026-08-05 19:14 UTCEPSS rescore
  44. 2026-08-05 01:11 UTCOSV refresh
  45. 2026-08-04 15:06 UTCEPSS rescore
  46. 2026-08-04 10:34 UTCEPSS rescore
  47. 2026-08-03 10:32 UTCEPSS rescore
  48. 2026-08-02 02:24 UTCEPSS rescore
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  50. 2026-07-30 16:25 UTCEPSS rescore
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  54. 2026-07-25 14:15 UTCEPSS rescore
  55. 2026-07-24 14:15 UTCEPSS rescore
  56. 2026-07-23 14:15 UTCEPSS rescore
  57. 2026-07-23 01:57 UTCEG score recompute
  58. 2026-07-22 22:43 UTCEG score recompute
  59. 2026-07-22 14:05 UTCEPSS rescore
  60. 2026-07-21 15:22 UTCEPSS rescore
  61. 2026-07-21 15:22 UTCEPSS rescore
  62. 2026-07-20 17:04 UTCEPSS rescore
  63. 2026-07-19 14:28 UTCEPSS rescore
  64. 2026-07-19 02:26 UTCEPSS rescore
  65. 2026-07-18 23:29 UTCOSV refresh
  66. 2026-07-18 10:02 UTCEPSS rescore
  67. 2026-07-16 17:00 UTCEPSS rescore
  68. 2026-07-15 16:55 UTCEPSS rescore
  69. 2026-07-15 16:55 UTCEPSS rescore
  70. 2026-07-15 01:57 UTCEPSS rescore
  71. 2026-07-13 22:27 UTCEPSS rescore
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  73. 2026-07-13 06:10 UTCEPSS rescore
  74. 2026-07-13 06:10 UTCEPSS rescore
  75. 2026-07-12 05:44 UTCEPSS rescore

Related CVEs(same product + same CWE)

Same product

1 shown

npm:isolated-vm

Frequently asked(5)

What is CVE-2021-21413?
CVE-2021-21413 is a high vulnerability published on March 30, 2021. 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…
When was CVE-2021-21413 disclosed?
CVE-2021-21413 was first published on March 30, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-21413 actively exploited?
CVE-2021-21413 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (52nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-21413?
CVE-2021-21413 has a CVSS v3 base score of 8.0 (NVD).
How do I remediate CVE-2021-21413?
A fix for CVE-2021-21413 is available: update to the fixed version the vendor names in its advisory.

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