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CVE Record

CVE-2017-16090: fsk-server is a simple http server.

fsk-server is a simple http server. fsk-server is vulnerable to a directory traversal issue, giving an attacker access to the filesystem by placing "../" in the url.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2017-16090 affects the fsk-server npm module, a simple HTTP server. Public records say all versions allow directory traversal, meaning a remote user may read files outside the intended web directory if the server is exposed. No source in the bundle confirms active exploitation or a fixed release.

Executive priority

Prioritize remediation if fsk-server is deployed in any reachable service. The issue can turn a small HTTP server into a file disclosure path, and the affected scope is broad, while patch guidance is not evidenced in the provided sources.

Technical view

The vulnerability is CWE-22 path traversal in fsk-server. The CVE description states attackers can place parent-directory sequences in a URL to access the filesystem. Affected scope is listed as all versions of the fsk-server node module. Severity, CVSS, and patch details are not provided in the source bundle.

Likely exposure

Exposure is most likely in legacy Node.js applications, demos, internal tools, or containers that still depend on fsk-server and expose it over HTTP. Internet-facing use raises business risk because filesystem disclosure can expose configuration, secrets, source code, or operational data.

Exploitation context

The source bundle includes a public proof-of-concept reference, but KEV is false and no cited source confirms exploitation in the wild. Treat exploitation status as unconfirmed, not absent.

Researcher notes

Evidence is limited to public CVE metadata and referenced advisories. The key gaps are missing CVSS, missing fixed-version data, and no confirmed exploitation signal. Validate actual reachability and filesystem permissions before assigning operational severity.

Mitigation direction

  • Inventory package manifests and lockfiles for fsk-server.
  • Remove or replace fsk-server where it is still used.
  • Do not expose fsk-server to untrusted networks.
  • Run the service with minimal filesystem privileges.
  • Check vendor or advisory sources for any maintained guidance.

Validation and detection

  • Use software composition analysis to detect CVE-2017-16090.
  • Search repositories, lockfiles, and container images for fsk-server.
  • Confirm whether any detected instance is reachable over HTTP.
  • Review logs for suspicious traversal-style path requests.
  • Verify runtime permissions limit access to sensitive files.
Prepared
Confidence
medium
Sources
4

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.

cwe · medium confidence lookup

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 lookup
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-2017-16090 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
3Source 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
HackerOnefsk-server node moduleAll versionsListed
Weakness

CWE details

CWE-22

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.