CVE intelligence and bounded remediation

CVE-2017-16743 — Phoenixcontact Fl Switch 3005 Firmware security vulnerability

Critical CVSS 9.8

An Improper Authorization issue was discovered in PHOENIX CONTACT FL SWITCH 3xxx, 4xxx, and 48xxx Series products running firmware Version 1.0 to 1.32. A remote unauthenticated attacker may be able to craft special HTTP requests allowing an attacker to bypass web-service authentication allowing the attacker to obtain administrative privileges on the device.

Severity
Critical
CVSS
9.8 (3.0)
Published
2018-01-12
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-285, CWE-863

Affected products

  • phoenixcontact / fl_switch_3005_firmware
  • phoenixcontact / fl_switch_3005t_firmware
  • phoenixcontact / fl_switch_3004t-fx_firmware
  • phoenixcontact / fl_switch_3004t-fx_st_firmware
  • phoenixcontact / fl_switch_3008_firmware
  • phoenixcontact / fl_switch_3008t_firmware

Showing 6 representative product identities from 30 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Authorization bypass, IDOR, and cross-tenant access

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Check exposure

  • Map object and action authorization checks across API, UI, batch, import/export, and background-job paths.
  • Identify tenant, ownership, role, and policy boundaries for affected resources and administrative operations.
  • Use synthetic fixtures to compare intended access matrices without accessing another user's real data.

Remediate safely

  • Enforce server-side authorization at each resource access and state transition using the authenticated principal and trusted tenant context.
  • Scope data queries by tenant and ownership; treat client-supplied identifiers, roles, and policy claims as untrusted.
  • Add deny-by-default policy tests for horizontal and vertical access across every affected transport.

Authoritative sources

Complete CVE record and remediation plan

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