CVE intelligence and bounded remediation

CVE-2018-13990 — Phoenixcontact Fl Switch 3005 Firmware security vulnerability

Critical CVSS 9.8

The WebUI of PHOENIX CONTACT FL SWITCH 3xxx, 4xxx, 48xx versions prior to 1.35 is vulnerable to brute-force attacks, because of Improper Restriction of Excessive Authentication Attempts.

Severity
Critical
CVSS
9.8 (3.0)
Published
2019-05-06
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-287

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 29 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Authentication bypass and missing authentication

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Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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