CVE-2021-38834: easy-mock v1.5.0-v1.6.0 allows remote attackers to bypass the vm2 sandbox and execute arbitrary system command

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HIGH 8.8UPGRADE

CVE-2021-38834 is a high-severity flaw (CVSS 8.8) affecting easy mock. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

easy-mock v1.5.0-v1.6.0 allows remote attackers to bypass the vm2 sandbox and execute arbitrary system commands through special js code.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	2.0% (top 19%)
CISA exploited list	No
Published	2022-04-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: easy-mock project

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

Am I affected?

Timeline

2022-04-05 11:15 UTCPublished CVE record published
2026-06-17 04:02 UTCUpdated Record last modified

easy-mock project easy mock UPGRADE

Affected: >= 1.5.0 and <= 1.6.0

Fixed in: newer than 1.6.0

Safe to downgrade to: a release before 1.5.0

1. Check installed version

apt-cache policy easy-mock || rpm -q easy-mock || easy-mock --version

2. UPGRADE to newer than 1.6.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade easy-mock

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade easy-mock

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.5.0 (Debian / Ubuntu)

apt-cache madison easy-mock sudo apt install easy-mock=<VERSION_BEFORE_1.5.0> sudo apt-mark hold easy-mock

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list easy-mock sudo dnf downgrade easy-mock-<VERSION_BEFORE_1.5.0> sudo dnf versionlock add easy-mock

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2021-38834?

easy mock: upgrade to newer than 1.6.0. Exact commands for each OS are on this page.

Is CVE-2021-38834 being exploited?

CVE-2021-38834 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-2021-38834 affect?

CVE-2021-38834 affects easy mock. Severity is high (CVSS 8.8). easy-mock v1.5.0-v1.6.0 allows remote attackers to bypass the vm2 sandbox and execute arbitrary system commands through special js code.

How urgent is CVE-2021-38834?

Priority 56/100. High severity; Public exploit reference

References

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