CVE-2021-23574: All versions of package js-data are vulnerable to Prototype Pollution via the deepFillIn and the set functions

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HIGH 7.5REMOTEUPGRADE

CVE-2021-23574 is a high-severity flaw (CVSS 7.5) affecting js-data. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

All versions of package js-data are vulnerable to Prototype Pollution via the deepFillIn and the set functions. This is an incomplete fix of [CVE-2020-28442](https://snyk.io/vuln/SNYK-JS-JSDATA-1023655).

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.2% (top 18%)
CISA exploited list	No
Weakness	CWE-1321
Published	2021-12-24
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: js-data

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

Am I affected?

Timeline

2021-12-24 20:15 UTCPublished CVE record published
2026-06-17 03:38 UTCUpdated Record last modified

js-data js-data UPGRADE

Affected: < 3.0.11

Fixed in: 3.0.11

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls js-data

2. UPGRADE to 3.0.11

npm install js-data@">=3.0.11"

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-2021-23574?

js-data: upgrade to 3.0.11. Exact commands for each OS are on this page.

Is CVE-2021-23574 being exploited?

CVE-2021-23574 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-2021-23574 affect?

CVE-2021-23574 affects js-data. Severity is high (CVSS 7.5). All versions of package js-data are vulnerable to Prototype Pollution via the deepFillIn and the set functions. This is an incomplete fix of [CVE-2020-28442](https://snyk.io/vuln/SNYK-JS-JSDATA-1023655).

How urgent is CVE-2021-23574?

Priority 57/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-28442 HIGH 7.5 MITIGATE All versions of package js-data are vulnerable to Prototype Pollution via the deepFillIn function.

References

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