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CVE-2021-23442

30
FAUCET Score

CVE-2021-23442 is a critical prototype pollution vulnerability (CWE-1321) affecting all versions of the @cookiex/deep package, allowing an attacker to manipulate the global proto object. With a CVSS score of 9.8, it presents a severe risk due to its network-based attack vector, low complexity, and high potential for confidentiality, integrity, and availability impacts. Despite its critical severity, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.0.6CPE matchmatch criteria
cpe:2.3:a:cookiex-deep_project:cookiex-deep:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

8.6HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
4.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.59%
Probability of exploitation in next 30 days
EPSS Percentile
73.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0159 is in the 60th 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: @cookiex/deepFixed in: 0.0.7

Vendor Advisories (1)

npmGHSA-92v9-xh2q-fq9fhigh

Prototype Pollution in cookiex/deep

Sep 20, 2021

References

github.com / tony-tsx/cookiex-deep/commit/b5bea2b7f34a5fa9abb4446cbd038ecdbcd09c88
PatchThird Party Advisory
github.com / tony-tsx/cookiex-deep/issues/1
Issue TrackingPatchThird Party Advisory
snyk.io / vuln/SNYK-JS-COOKIEXDEEP-1582793
ExploitPatchThird Party Advisory