{"cve":"CVE-2021-21413","nvd":{"published":"2021-03-30T23:15:14.190","modified":"2026-06-17T03:35:31.607","status":"Modified","description":"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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","score":9.6},"cwes":["CWE-913"],"references":["https://github.com/laverdet/isolated-vm/blob/main/CHANGELOG.md#v400","https://github.com/laverdet/isolated-vm/commit/2646e6c1558bac66285daeab54c7d490ed332b15","https://github.com/laverdet/isolated-vm/commit/27151bfecc260e96714443613880e3b2e6596704","https://github.com/laverdet/isolated-vm/security/advisories/GHSA-mmhj-4w6j-76h7","https://github.com/laverdet/isolated-vm/blob/main/CHANGELOG.md#v400"],"products":["isolated-vm_project:isolated-vm"],"source":"nvd","synced_at":"2026-10-19T21:17:01.373894544+00:00"},"epss":{"cve":"CVE-2021-21413","score":0.00719,"percentile":0.53912,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-mmhj-4w6j-76h7","url":"https://osv.dev/vulnerability/GHSA-mmhj-4w6j-76h7","summary":"Misuse of `Reference` and other transferable APIs may lead to access to nodejs isolate","modified":"2026-07-08T06:29:10.244133102Z","packages":[{"ecosystem":"npm","name":"isolated-vm","purl":"pkg:npm/isolated-vm","ranges":["<4.0.0"],"fixed":["4.0.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}