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CVE Record

CVE-2021-42863: A buffer overflow in ecma_builtin_typedarray_prototype_filter() in JerryScript version fe3a5c0 allows an at...

A buffer overflow in ecma_builtin_typedarray_prototype_filter() in JerryScript version fe3a5c0 allows an attacker to construct a fake object or a fake arraybuffer with unlimited size.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

JerryScript had a reported buffer overflow in TypedArray filtering logic. In affected source version fe3a5c0, malformed JavaScript objects could create fake objects or array buffers with unrealistic size. Business urgency depends on whether your products embed this JerryScript build.

Executive priority

Set priority after asset discovery. If JerryScript is embedded in externally reachable or user-scriptable products, treat remediation as time-sensitive because the issue is memory corruption. If JerryScript is not used, no direct action is indicated.

Technical view

CVE-2021-42863 concerns ecma_builtin_typedarray_prototype_filter() in JerryScript version fe3a5c0. The CVE says the flaw enables construction of a fake object or fake ArrayBuffer with unlimited size. The record provides no CVSS, CWE, CPE, fixed release, or supported affected-version range.

Likely exposure

Exposure is most likely in embedded products, firmware, tooling, or applications that include JerryScript source around version fe3a5c0. The CVE record does not identify vendor products, CPEs, distributions, or downstream consumers, so exposure must be confirmed from software composition data.

Exploitation context

The provided bundle does not show active exploitation. KEV is false, and the cited sources are a GitHub issue and pull request rather than exploitation reports. Treat this as a memory-safety vulnerability requiring inventory validation, not as confirmed in-the-wild activity.

Researcher notes

The public record is sparse: no CVSS, CWE, CPEs, fixed version, or exploit evidence are included. The safest research path is source comparison between fe3a5c0 and PR 4794, followed by defensive validation in affected builds.

Mitigation direction

  • Inventory products and firmware that embed JerryScript.
  • Check whether any build is based on JerryScript fe3a5c0.
  • Review JerryScript issue 4793 and pull request 4794 for maintainer guidance.
  • Update to a JerryScript revision containing the confirmed maintainer fix.
  • If no fix is confirmed, ask the vendor for supported remediation guidance.

Validation and detection

  • Search SBOMs and source manifests for JerryScript dependencies.
  • Confirm the exact JerryScript commit or release in each product.
  • Verify whether ecma_builtin_typedarray_prototype_filter() matches vulnerable source lineage.
  • Check vendor release notes for a fix tied to pull request 4794.
  • Document affected assets where JavaScript input can reach JerryScript execution.
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

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CVE-2021-42863 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
3Source 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.