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CVE Record

CVE-2021-23403: Prototype Pollution

All versions of package ts-nodash are vulnerable to Prototype Pollution via the Merge() function due to lack of validation input.

HighCVSS 7.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-23403 affects the JavaScript package ts-nodash. Its Merge() function can allow prototype pollution when unsafe input is merged. In business terms, an application using this package could have object behavior unexpectedly changed, potentially affecting confidentiality, integrity, and availability.

Executive priority

Treat this as a high-priority dependency risk where ts-nodash is present in exposed services. Urgency depends on whether Merge() processes untrusted input.

Technical view

The source bundle describes prototype pollution in all versions of ts-nodash through Merge(), caused by missing input validation. CVSS 3.1 score is 7.3, network exploitable, low complexity, no privileges, and no user interaction. The bundle does not identify a patched version.

Likely exposure

Exposure is likely limited to JavaScript or TypeScript applications that depend on ts-nodash and use Merge() on attacker-controlled objects, JSON, configuration, or request data.

Exploitation context

The CVE is not in KEV, so the bundle does not support active exploitation. The CVSS vector lists proof-of-concept exploit maturity, but no exploit details are needed to assess risk.

Researcher notes

Evidence is concise: affected package, vulnerable function, weakness class, CVSS vector, and references are provided. Patch status and exact version boundaries are not clear in the bundle, so remediation should rely on current vendor or advisory guidance.

Mitigation direction

  • Check Snyk, CVE, and maintainer guidance for any fixed release or official workaround.
  • Remove or replace ts-nodash if no maintained fixed version is available.
  • Avoid passing untrusted objects into Merge() until remediation is complete.
  • Add input validation that rejects dangerous object keys before merge operations.
  • Prioritize fixes in internet-facing services and APIs handling user JSON.

Validation and detection

  • Inventory package manifests and lockfiles for ts-nodash usage.
  • Identify code paths calling Merge() with request, webhook, or configuration input.
  • Confirm dependency scanners flag CVE-2021-23403 where ts-nodash is present.
  • Review runtime tests covering merge behavior on untrusted structured input.
  • Verify remediation by rescanning dependencies after removal, replacement, or vendor fix.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2021-23403 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:U/RC:C

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.3CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:U/RC:C3.93.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.3High
CVSS 3.1 vector shape for CVE-2021-23403Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:U/RC:C

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/ats-nodash0Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.