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CVE-2021-25948

29
FAUCET Score

CVE-2021-25948 is a critical prototype pollution vulnerability affecting expand-hash versions 0.1.0 through 1.0.1. This flaw allows an unauthenticated attacker to remotely trigger a denial of service and potentially achieve remote code execution. With a CVSS score of 9.8, it represents a severe risk due to its network-based attack vector and low complexity. Despite its high severity, there is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.1.0, <= 1.0.1CPE matchmatch criteria
cpe:2.3:a:expand-hash_project:expand-hash:*:*:*:*:*:*:*:*

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 36,835 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-x3wr-v4wx-5qpccritical

Prototype Pollution

Jun 21, 2021

References

github.com / doowb/expand-hash/blob/556913f6c2f05848110b5b8261cfc78e5ce3dc77/index.js
ExploitThird Party Advisory
whitesourcesoftware.com / vulnerability-database/CVE-2021-25948
ExploitThird Party Advisory