Security readout for executives and security teams
Plain-English summary
CVE-2020-36366 is a denial-of-service issue in Cesanta MJS 1.20.1. A crafted file can trigger a stack overflow during value parsing, potentially crashing software that uses this JavaScript engine. Business urgency depends on whether affected software processes untrusted files.
Executive priority
Treat as a targeted availability risk. Prioritize assessment for internet-facing or externally supplied file-processing systems; otherwise handle through normal vulnerability management pending vendor guidance.
Technical view
The reported flaw is a stack overflow in MJS 1.20.1 parse_value. The CVE description says remote attackers may cause DoS via a crafted file. The source bundle does not provide CVSS, CWE, CPEs, patch details, or affected downstream products.
Likely exposure
Exposure is likely limited to systems or products embedding Cesanta MJS 1.20.1 and parsing attacker-controlled files. The sources do not identify specific downstream products, CPEs, or deployment patterns.
Exploitation context
No active exploitation is indicated in the provided sources, and the CVE is not listed as KEV. Public information only supports a crafted-file denial-of-service condition, without exploit maturity or real-world targeting evidence.
Researcher notes
Evidence is sparse. The affected field in the bundle is not populated, but the CVE description names Cesanta MJS 1.20.1. Do not assume other versions or products are affected without vendor confirmation.
Mitigation direction
- Inventory software, firmware, or services that embed Cesanta MJS.
- Identify whether any discovered instance uses MJS 1.20.1.
- Check Cesanta and product vendor guidance for fixed versions or mitigations.
- Restrict processing of untrusted files until vendor guidance is applied.
Validation and detection
- Search dependency and firmware manifests for Cesanta MJS references.
- Confirm exact MJS version where the component is present.
- Review file-ingestion paths for attacker-controlled input reaching MJS parsing.
- Track the GitHub issue and CVE record for remediation updates.
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-2020-36366 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
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/106CVE 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.