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CVE-2021-46463: njs through 0.7.1, used in NGINX, was discovered to contain a control flow hijack caused by a Type Confusio...

njs through 0.7.1, used in NGINX, was discovered to contain a control flow hijack caused by a Type Confusion vulnerability in njs_promise_perform_then().

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2021-46463 affects njs, the JavaScript engine used with NGINX. The provided record says versions through 0.7.1 have a type confusion flaw that can hijack control flow. Business urgency depends on whether njs is enabled in your NGINX or vendor appliances; the supplied data does not provide CVSS, active exploitation, or complete downstream impact.

Executive priority

Treat this as a targeted inventory and remediation item, not an evidence-backed active incident. Prioritize internet-facing or business-critical NGINX systems using njs, and require vendor confirmation for appliances or packaged distributions.

Technical view

The flaw is described as type confusion in njs_promise_perform_then(), leading to control flow hijack in njs through 0.7.1. A GitHub issue and fixing commit are referenced, and NetApp issued an advisory. The source bundle does not provide CVSS, CWE, exploitability conditions, or a complete affected-product matrix.

Likely exposure

Most relevant exposure is NGINX environments or vendor products that embed njs through 0.7.1. The supplied CVE data lists affected vendor/product as n/a, so exposure must be confirmed by package inventory and vendor advisories rather than assumed broadly.

Exploitation context

The source bundle does not show CISA KEV listing or any cited evidence of active exploitation. The vulnerability class is potentially serious because it mentions control flow hijack, but practical exploitability and prerequisites are not established in the provided sources.

Researcher notes

Key evidence is limited to the CVE description, NGINX njs issue, fixing commit, and NetApp advisory reference. The affected range is stated as njs through 0.7.1, but no CVSS, CWE, trigger conditions, or exploit maturity details are provided.

Mitigation direction

  • Inventory NGINX deployments and confirm whether njs is installed or enabled.
  • Check installed njs versions and prioritize anything through 0.7.1 for review.
  • Apply vendor-supported updates that include the referenced njs fix.
  • Review NetApp guidance if using affected NetApp-managed products.
  • Monitor NGINX njs and vendor advisories for exact fixed-version guidance.

Validation and detection

  • Record njs package versions across servers, containers, and build images.
  • Confirm whether NGINX configurations load or depend on njs functionality.
  • Map vendor appliances or managed products against the NetApp advisory.
  • Verify updated packages include or postdate the referenced fixing commit.
  • Document exceptions where njs is absent, disabled, or vendor-confirmed unaffected.
Prepared
Confidence
medium
Sources
5

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-2021-46463 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
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.

0CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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