CVE-2021-23558: The package bmoor before 0.10.1 are vulnerable to Prototype Pollution due to missing sanitization in set funct

This week

HIGH 7.3REMOTEUPGRADE

CVE-2021-23558 is a high-severity flaw (CVSS 7.3) affecting bmoor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The package bmoor before 0.10.1 are vulnerable to Prototype Pollution due to missing sanitization in set function. **Note:** This vulnerability derives from an incomplete fix in [CVE-2020-7736](https://security.snyk.io/vuln/SNYK-JS-BMOOR-598664)

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	7.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-1321
Published	2022-01-28
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: bmoor project

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

Am I affected?

Timeline

2022-01-28 22:15 UTCPublished CVE record published
2026-06-17 03:38 UTCUpdated Record last modified

bmoor project bmoor UPGRADE

Affected: < 0.10.1

Fixed in: 0.10.1

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls bmoor

2. UPGRADE to 0.10.1

npm install bmoor@">=0.10.1"

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-2021-23558?

bmoor: upgrade to 0.10.1. Exact commands for each OS are on this page.

Is CVE-2021-23558 being exploited?

CVE-2021-23558 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-2021-23558 affect?

CVE-2021-23558 affects bmoor. Severity is high (CVSS 7.3). The package bmoor before 0.10.1 are vulnerable to Prototype Pollution due to missing sanitization in set function. **Note:** This vulnerability derives from an incomplete fix in [CVE-2020-7736](https://security.snyk.io/vuln/SNYK-JS-BMOOR-59

How urgent is CVE-2021-23558?

Priority 55/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-7736 HIGH 7.3 UPGRADE The package bmoor before 0.8.12 are vulnerable to Prototype Pollution via the set function.

References

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