Security readout for executives and security teams
Plain-English summary
mfrserver, a Node.js simple file server, can expose files outside its intended directory through URL path traversal. If reachable by untrusted users, it may disclose sensitive server files. The bundle lists all versions affected, but provides no CVSS score or vendor fix details.
Executive priority
Prioritize exposed deployments because the issue can turn a simple file server into a path for sensitive file disclosure. Urgency is lower only if the package is absent or isolated from untrusted users.
Technical view
CVE-2017-16213 is a CWE-22 directory traversal flaw in the mfrserver node module. The description says an attacker can place traversal sequences in the URL to access the filesystem. Affected scope is listed as all versions. No exploit-in-the-wild evidence, CVSS vector, or remediation version is included.
Likely exposure
Exposure is most likely where mfrserver is installed and serving files to external or untrusted users. Internal-only use still matters if sensitive local files are reachable from the service account context.
Exploitation context
The source bundle references public vulnerability material and a public proof-of-concept repository, but KEV is false and no cited source states active exploitation. Treat exploit availability as public research evidence, not confirmed in-the-wild exploitation.
Researcher notes
Evidence is limited to the CVE description, affected package statement, CWE classification, and public references. The bundle says all versions are affected, but does not name a patched version, CVSS score, or confirmed active exploitation.
Mitigation direction
- Identify all projects depending on the mfrserver npm module.
- Remove or replace mfrserver where it is exposed to untrusted users.
- Check vendor or package advisory guidance for supported fixes.
- Restrict service filesystem permissions to only required served content.
- Block direct external access if replacement cannot happen immediately.
Validation and detection
- Inventory package-lock, npm-shrinkwrap, and runtime deployments for mfrserver.
- Confirm whether any mfrserver instance is internet-facing or user-reachable.
- Review served directories and service account filesystem permissions.
- Test defensively that traversal requests cannot read files outside the web root.
- Check logs for suspicious path traversal request patterns.
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-2017-16213 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/JacksonGL/NPM-Vuln-PoC/blob/master/directory-traversal/mfrserverCVE reference · x_refsource_MISC
- https://nodesecurity.io/advisories/421CVE 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.