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CVE Record

CVE-2021-31684: A vulnerability was discovered in the indexOf function of JSONParserByteArray in JSON Smart versions 1.3 an...

A vulnerability was discovered in the indexOf function of JSONParserByteArray in JSON Smart versions 1.3 and 2.4 which causes a denial of service (DOS) via a crafted web request.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-31684 is a denial-of-service issue in JSON Smart, a Java JSON parsing library. A specially crafted web request can make affected parsing code fail or consume service capacity. The source bundle identifies JSON Smart versions 1.3 and 2.4, with downstream advisories from Oracle, Debian, and NetApp.

Executive priority

Treat this as a service-availability risk rather than confirmed data compromise. Prioritize remediation where affected libraries sit behind public APIs, customer portals, or critical operational workflows, especially in vendor-managed stacks referenced by advisories.

Technical view

The vulnerability is in JSONParserByteArray.indexOf in JSON Smart versions 1.3 and 2.4. The reported impact is denial of service through crafted web requests. Public GitHub issues and pull requests exist for v1 and v2, and downstream vendors issued advisories, but the bundle provides no CVSS, CWE, or detailed affected product list.

Likely exposure

Exposure is most likely in Java applications or vendor products that include JSON Smart 1.3 or 2.4 and parse untrusted JSON from web requests. The bundle does not identify specific first-party products beyond downstream advisory references.

Exploitation context

The CVE is not listed as KEV in the provided bundle, and no cited source claims active exploitation. Public issue and pull request references mean defenders should assume technical details are discoverable, but exploitation status is not established here.

Researcher notes

Evidence is narrow: function name, affected versions, and denial-of-service impact are stated, but CVSS, CWE, root-cause detail, and exact fixed versions are not present in the bundle. Avoid expanding affected products beyond confirmed dependency or vendor-advisory evidence.

Mitigation direction

  • Inventory applications and vendor products for JSON Smart 1.3 or 2.4.
  • Apply JSON Smart maintainer updates or downstream vendor updates where applicable.
  • Review Oracle, Debian, and NetApp advisories if those environments are present.
  • Prioritize internet-facing services that parse unauthenticated or untrusted JSON requests.

Validation and detection

  • Check SBOMs, dependency manifests, and runtime classpaths for json-smart artifacts.
  • Confirm deployed versions are not JSON Smart 1.3 or 2.4.
  • Map findings to services that accept web JSON input.
  • Verify applicable vendor advisories are applied and documented.
Prepared
Confidence
medium
Sources
10

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-2021-31684 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
9Source 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.