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CVE-2020-18392: Stack overflow vulnerability in parse_array Cesanta MJS 1.20.1, allows remote attackers to cause a Denial o...

Stack overflow vulnerability in parse_array Cesanta MJS 1.20.1, allows remote attackers to cause a Denial of Service (DoS) via a crafted file.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

A crafted file can crash Cesanta MJS 1.20.1 when array parsing triggers a stack overflow. The disclosed impact is denial of service, not data theft or code execution. Evidence is sparse, so treat urgency as context-dependent.

Executive priority

Assign a vulnerability manager to confirm whether MJS 1.20.1 is present. Escalate if it processes customer-supplied or internet-sourced files in production.

Technical view

The CVE describes a stack overflow in parse_array in Cesanta MJS 1.20.1, reachable through a crafted file. The reference to CWE-674 suggests recursion-related risk, but the bundle does not provide CVSS, affected CPEs, a fixed version, or vendor mitigation details.

Likely exposure

Exposure is likely limited to systems or products that include Cesanta MJS 1.20.1 and parse untrusted files or input. The source bundle does not identify packaged downstream products or CPEs.

Exploitation context

The CVE says remote attackers can cause denial of service via a crafted file. There is no KEV listing in the bundle and no cited evidence of active exploitation.

Researcher notes

Public metadata is incomplete: no CVSS, no named fix, no CPEs, and no confirmed exploitation. Analysis should stay anchored to the parse_array stack overflow and denial-of-service claim.

Mitigation direction

  • Inventory software and firmware for Cesanta MJS 1.20.1 usage.
  • Check Cesanta MJS project guidance for a fixed version or workaround.
  • Restrict untrusted file processing where MJS 1.20.1 is present.
  • Prioritize replacement or isolation for internet-facing parsing paths.

Validation and detection

  • Confirm whether Cesanta MJS 1.20.1 exists in source, dependencies, or firmware.
  • Identify services that parse externally supplied files using MJS.
  • Review crash logs for stack overflow or parser failure patterns.
  • Track vendor issue status before asserting remediation completeness.
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.

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CVE-2020-18392 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.