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CVE-2021-25927

30
FAUCET Score

CVE-2021-25927 is a critical prototype pollution vulnerability affecting safe-flat versions 2.0.0 through 2.0.1. 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 presents a severe risk due to its network-based attack vector and low complexity. While no public exploits, Metasploit modules, or Nuclei templates are currently available, and there is minimal community discussion, the potential for high impact necessitates immediate patching.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.0.0, < 2.0.2CPE matchmatch criteria
cpe:2.3:a:safe-flat_project:safe-flat:*:*:*:*:*:*:*:*

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: safe-flatFixed in: 2.0.2

Vendor Advisories (1)

npmGHSA-33rv-m2gp-mm2rcritical

Prototype pollution in safe-flat

Jun 21, 2021

References

github.com / jessie-codes/safe-flat/commit/4b9b7db976bba8c968354f4315f5f9c219b7cbf3
PatchThird Party Advisory
whitesourcesoftware.com / vulnerability-database/CVE-2021-25927
ExploitThird Party Advisory