Security readout for executives and security teams
Plain-English summary
CVE-2020-36374 is a denial-of-service issue in Cesanta MJS 1.20.1. A specially crafted file can trigger a stack overflow while the JavaScript parser handles comparisons, potentially crashing software that uses this engine on untrusted input.
Executive priority
Treat this as a targeted availability risk. Prioritize systems where embedded scripting is exposed to customers, partners, or the internet. Business urgency is lower than remote code execution, but crashes in control planes, gateways, or embedded devices can still disrupt operations.
Technical view
The source bundle describes a stack overflow in the parse_comparison function of Cesanta MJS 1.20.1. The reported impact is denial of service via a crafted file. No CVSS vector, CWE, confirmed fixed version, or broader affected product list is provided.
Likely exposure
Exposure is most likely in embedded products, services, or tooling that include Cesanta MJS 1.20.1 and parse JavaScript files or scripts supplied by users, network peers, or external integrations.
Exploitation context
The CVE record does not indicate CISA KEV listing or active exploitation. The available evidence supports a crafted-file denial-of-service scenario, not code execution or privilege escalation.
Researcher notes
Evidence is sparse: the bundle provides a CVE description and one GitHub issue reference, but no CVSS, CWE, patch statement, or detailed affected CPEs. Avoid expanding scope beyond Cesanta MJS 1.20.1 unless vendor evidence confirms additional versions.
Mitigation direction
- Inventory products and firmware for Cesanta MJS 1.20.1 usage.
- Check Cesanta MJS issue and vendor guidance for fixed releases or patches.
- Restrict untrusted script or file parsing where MJS is embedded.
- Run parser components with crash isolation or service supervision where possible.
- Add input size and complexity limits around script ingestion.
Validation and detection
- Confirm whether any deployed component embeds Cesanta MJS 1.20.1.
- Map all routes or interfaces that accept JavaScript-like files or scripts.
- Review crash logs for stack overflow or parse_comparison failures.
- Use non-production regression testing to confirm parser crash handling.
- Verify vendor guidance before declaring remediation complete.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2020-36374 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/cesanta/mjs/issues/136CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.