Security readout for executives and security teams
Plain-English summary
CVE-2017-16166 affects the byucslabsix Node.js HTTP server module. The issue can let a remote user request files outside the intended web directory, potentially exposing sensitive local files. The provided sources list all versions as affected, but do not provide a CVSS score or a fixed version.
Executive priority
Treat as a targeted exposure review rather than an emergency without evidence of active exploitation. Prioritize any internet-facing service using this module because the impact could include sensitive file disclosure.
Technical view
The vulnerability is CWE-22 path traversal in the byucslabsix Node module. A crafted URL can traverse directories and access filesystem content beyond the intended served path. Sources identify all versions as affected. No patch version, configuration workaround, or vendor advisory detail is included in the provided bundle.
Likely exposure
Exposure is most likely in Node.js applications that depend on byucslabsix and expose its HTTP server to users or the internet. Internal-only use still matters if untrusted users can reach it.
Exploitation context
The CVE is not listed as KEV, so the bundle does not support active exploitation claims. A public proof-of-concept reference is listed, indicating reproducibility information exists, but no exploitation prevalence is provided.
Researcher notes
Evidence is sparse: the bundle identifies CWE-22, all versions affected, and public references, but lacks CVSS, fixed version, exploit status, or detailed advisory text. Validate presence and reachability before assigning business urgency.
Mitigation direction
- Inventory applications for the byucslabsix dependency.
- Check npm or vendor guidance for any replacement or fixed package information.
- Remove or replace byucslabsix where feasible, since all versions are listed affected.
- Restrict access to services using the module until remediation is complete.
- Run the service with least-privilege filesystem permissions.
Validation and detection
- Search dependency manifests and lockfiles for byucslabsix.
- Confirm whether any reachable HTTP service uses the affected module.
- Review service logs for suspicious path traversal attempts.
- Verify filesystem permissions limit readable sensitive files.
- Document compensating controls if replacement is delayed.
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.
CWE-22: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupFile 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 lookupCVE-2017-16166 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://nodesecurity.io/advisories/399CVE reference · x_refsource_MISC
- https://github.com/JacksonGL/NPM-Vuln-PoC/blob/master/directory-traversal/byucslabsixCVE 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.