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CVE-2021-25952

32
FAUCET Score

CVE-2021-25952 is a critical prototype pollution vulnerability affecting just-safe-set versions 1.0.0 through 2.2.1. This flaw allows an unauthenticated attacker to cause a denial of service and potentially achieve remote code execution. With a CVSS score of 9.8, it represents a high-impact, low-complexity threat that can be exploited over the network. While there is no evidence of active exploitation or publicly available exploit code, the vulnerability has garnered significant community discussion, indicating awareness among security researchers.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.0.0, <= 2.2.1CPE matchmatch criteria
cpe:2.3:a:just-safe-set_project:just-safe-set:*:*:*:*:*: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
3.34%
Probability of exploitation in next 30 days
EPSS Percentile
87.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0334 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

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: just-safe-setFixed in: 2.2.2

Vendor Advisories (1)

npmGHSA-v26w-gcxh-v4r7critical

Prototype polluation in just-safe-set

Dec 10, 2021

References

github.com / angus-c/just/commit/dd57a476f4bb9d78c6f60741898dc04c71d2eb53
PatchThird Party Advisory
whitesourcesoftware.com / vulnerability-database/CVE-2021-25952
ExploitThird Party Advisory