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CVE-2021-23558

29
FAUCET Score

CVE-2021-23558 is a critical Prototype Pollution vulnerability affecting the bmoor package prior to version 0.10.1, stemming from an incomplete fix for CVE-2020-7736. With a CVSS score of 9.8, this vulnerability allows unauthenticated attackers to execute arbitrary code with high impact on confidentiality, integrity, and availability. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.10.1CPE matchmatch criteria
cpe:2.3:a:bmoor_project:bmoor:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

7.3HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.63%
Probability of exploitation in next 30 days
EPSS Percentile
73.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0163 is in the 61st percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: bmoorFixed in: 0.10.1

Vendor Advisories (1)

npmGHSA-4m8h-h59m-m34jhigh

Prototype Pollution in bmoor

Feb 1, 2022

References

github.com / b-heilman/bmoor/commit/29b0162cc1dc1791fc060891f568b0ae29bc542b
PatchThird Party Advisory
snyk.io / blog/remediate-javascript-type-confusion-bypassed-input-validation
Third Party Advisory
snyk.io / vuln/SNYK-JS-BMOOR-2342622
ExploitThird Party Advisory