Security readout for executives and security teams
Plain-English summary
Software using Cesanta MJS 1.20.1 may crash when it processes a specially crafted file. For executives, the known business risk is denial of service: affected systems could become unavailable if exposed to malicious input. The public bundle does not show active exploitation or a confirmed patch.
Executive priority
Treat this as a targeted availability risk. Prioritize systems where MJS parses remotely supplied content or supports internet-facing workflows. If MJS is only used offline with trusted inputs, urgency is lower, but inventory should still be completed.
Technical view
CVE-2020-36373 is a stack overflow in parse_shifts in Cesanta MJS 1.20.1. A crafted file can cause denial of service. The CVE data does not provide CVSS, CWE, affected CPEs, exact downstream products, or a confirmed fixed version.
Likely exposure
Exposure is most likely in products, firmware, services, or tools that embed Cesanta MJS 1.20.1 and allow untrusted files or scripts to reach the MJS parser. The source bundle does not identify downstream vendors or CPEs.
Exploitation context
The bundle shows no KEV listing and provides no cited evidence of active exploitation. The described abuse requires a crafted file reaching the affected MJS parsing path. Available sources support denial of service only, not code execution.
Researcher notes
The public record is sparse: no CVSS vector, CWE, CPEs, or fixed version are present in the provided bundle. Analysis should stay scoped to Cesanta MJS 1.20.1 and denial of service unless additional primary sources confirm broader impact.
Mitigation direction
- Inventory applications, firmware, and libraries for Cesanta MJS 1.20.1 usage.
- Check the upstream GitHub issue and vendor guidance for fixed versions or workarounds.
- Block or restrict untrusted files from reaching MJS parsing paths.
- Run MJS-dependent services with isolation and restart controls to reduce outage impact.
- Monitor affected services for parser crashes or repeated unexpected restarts.
Validation and detection
- Review SBOMs, lockfiles, vendored source, and firmware contents for MJS 1.20.1.
- Map all code paths that pass external files or scripts into MJS.
- Confirm whether the parse_shifts parser path is reachable from remote input.
- Check crash logs for stack overflow or parser failure indicators.
- Validate any vendor-recommended update in staging before production rollout.
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-2020-36373 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.