CVE-2021-3815: utils.js is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollut

Q: How do I fix CVE-2021-3815?

utils.js: upgrade to 0.17.2. Exact commands for each OS are on this page.

Q: Is CVE-2021-3815 being exploited?

CVE-2021-3815 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-3815 affect?

CVE-2021-3815 affects utils.js. Severity is critical (CVSS 9.8). utils.js is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Q: How urgent is CVE-2021-3815?

Priority 59/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2021-3815 is a critical-severity flaw (CVSS 9.8) affecting utils.js. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

utils.js is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-1321
Published	2021-12-08
Last modified	2026-06-17

Publisher (CNA): huntr.dev · Vendor: utils.js project

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

Am I affected?

Timeline

2021-12-08 17:15 UTCPublished CVE record published
2026-06-17 04:05 UTCUpdated Record last modified

utils.js project utils.js UPGRADE

Affected: < 0.17.2

Fixed in: 0.17.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy utils.js || rpm -q utils.js || utils.js --version

2. UPGRADE to 0.17.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade utils.js

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade utils.js

Note

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

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-2021-3815?

utils.js: upgrade to 0.17.2. Exact commands for each OS are on this page.

Is CVE-2021-3815 being exploited?

CVE-2021-3815 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-2021-3815 affect?

CVE-2021-3815 affects utils.js. Severity is critical (CVSS 9.8). utils.js is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

How urgent is CVE-2021-3815?

Priority 59/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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