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CVE-2021-25943

32
FAUCET Score

CVE-2021-25943 is a critical prototype pollution vulnerability affecting versions 1.0.0 through 1.6.3 of the '101' project. This flaw allows an unauthenticated attacker to remotely trigger a denial of service and potentially achieve remote code execution due to its high impact on confidentiality, integrity, and availability. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion with 10 mentions, indicating awareness. Its CVSS score of 9.8 (Critical) and FAUCET Risk Score of 94/100 highlight its severe nature.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.0.0, <= 1.6.3CPE matchmatch criteria
cpe:2.3:a:101_project:101:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.30%
Probability of exploitation in next 30 days
EPSS Percentile
87.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0330 is in the 79th 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

Vendor Advisories (1)

npmGHSA-cwcx-rxgc-cmw3critical

Prototype pollution in 101

May 17, 2021

References

github.com / tjmehta/101/blob/d87f63ce2a4cbdc476e8287abd78327c3144d646/set.js
ExploitThird Party Advisory
whitesourcesoftware.com / vulnerability-database/CVE-2021-25943
ExploitThird Party Advisory