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CVE-2023-37781: An issue in the emqx_sn plugin of EMQX v4.3.8 allows attackers to execute a directory traversal via uploadi...

An issue in the emqx_sn plugin of EMQX v4.3.8 allows attackers to execute a directory traversal via uploading a crafted .txt file.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2023-37781 describes a directory traversal issue in the emqx_sn plugin for EMQX v4.3.8. A crafted .txt upload may let an attacker reach paths outside the intended upload location. Public details are sparse, with no CVSS score, fixed version, or exploitation evidence provided in the supplied sources.

Executive priority

Treat this as a targeted exposure review, not a confirmed emergency. Prioritize if EMQX v4.3.8 with emqx_sn is internet-facing or supports untrusted uploads, because directory traversal can affect sensitive files depending on implementation context.

Technical view

The reported flaw is in EMQX v4.3.8's emqx_sn plugin and involves directory traversal through crafted .txt file upload handling. The sources do not define authentication requirements, reachable endpoints, filesystem impact, CWE, CVSS, affected build range beyond v4.3.8, or a vendor-stated remediation.

Likely exposure

Exposure appears limited to environments running EMQX v4.3.8 with the emqx_sn plugin present and file upload functionality reachable. The supplied CVE metadata does not identify broader affected versions or deployment prerequisites.

Exploitation context

The source bundle does not show CISA KEV listing or public active exploitation evidence. It only describes the vulnerability class and a crafted .txt upload vector at a high level.

Researcher notes

Evidence is incomplete. The CVE record provides a terse description and one GitHub issue reference, but no patch, CVSS, CWE, prerequisites, exploit maturity, or full affected-version matrix. Avoid assuming impact beyond the named EMQX v4.3.8 emqx_sn context.

Mitigation direction

  • Check EMQX vendor guidance and issue updates for fixed versions or configuration advice.
  • Identify EMQX v4.3.8 systems and whether emqx_sn is enabled.
  • Disable or restrict unnecessary emqx_sn functionality where business impact allows.
  • Limit access to upload-capable interfaces to trusted networks and users.
  • Monitor vendor channels because the supplied sources do not name a patch.

Validation and detection

  • Inventory EMQX deployments and confirm exact version numbers.
  • Check whether the emqx_sn plugin is installed, enabled, and externally reachable.
  • Review logs for unusual .txt uploads or unexpected filesystem path activity.
  • Compare current configuration against any vendor guidance linked from the GitHub issue.
Prepared
Confidence
low
Sources
3

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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

description · low confidence lookup

File access behavior lookup

The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2023-37781 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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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
2Source 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.