9.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2021-23373

CVE-2021-23373: set-deep-prop Prototype Pollution

All versions of package set-deep-prop are vulnerable to Prototype Pollution via the main functionality.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2021-23373

CVE-2021-23373:

9.8

CVSS Score

3.1

-

CVSS Score

Basic Information

Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
set-deep-prop	npm	<= 1.0.0

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

All advisories explicitly state vulnerability exists in the main functionality
The PoC demonstrates prototype pollution through direct use of setDeepProp
The package's purpose is deep property assignment, which inherently risks prototype pollution if path validation is missing
No other functions are mentioned in vulnerability reports, and the package appears to be a single-function utility
The attack pattern matches classic prototype pollution via uncontrolled path parameters in deep assignment functions

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

WAF Protection Rules

WAF Rule

W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.

Reasoning

*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.

9.8

-

Basic Information

Basic Information

Concerned about an active attack path?

CVE-2021-23373: set-deep-prop Prototype Pollution

CVE-2021-23373:

9.8

-

Basic Information

Basic Information

Technical Details

Technical Details

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

Vulnerability IntelligenceMiggo AI

9.8

9.8

Technical Details

Basic Information

Basic Information

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

CVE-2021-23373: set-deep-prop Prototype Pollution

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI