What is CVE-2021-23555?

CVE-2021-23555 is a critical-severity vulnerability in Vm2 Project. CVSS score: 9.8/10. Published 2022-02-11.

How severe is CVE-2021-23555?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-23555 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Vm2 Project

CVE-2021-23555

The package vm2 before 3.9.6 are vulnerable to Sandbox Bypass via direct access to host error objects generated by node internals during generation of a stacktraces, which can lead to execution of arbitrary code on the host machine.

Published 2022-02-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.029 (86.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.029 · newest: 0.029 · change: 0.000

Affected products

Vm2 Project
Vm2 — versions unspecified

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

snyk.io/vuln/SNYK-JS-VM2-2309905 (Exploit, Patch, Third Party Advisory)
github.com/patriksimek/vm2/commit/532120d5cdec7da8225fc6242e154ebabc63fe4d (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-23555?: CVE-2021-23555 is a critical-severity vulnerability in Vm2 Project. CVSS score: 9.8/10. Published 2022-02-11.
How severe is CVE-2021-23555?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-23555 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.