CVE intelligence and bounded remediation

CVE-2019-6855 — Schneider-Electric Ecostruxure Control Expert security vulnerability

High CVSS 7.5

Incorrect Authorization vulnerability exists in EcoStruxure Control Expert (all versions prior to 14.1 Hot Fix), Unity Pro (all versions), Modicon M340 (all versions prior to V3.20) , and Modicon M580 (all versions prior to V3.10), which could cause a bypass of the authentication process between EcoStruxure Control Expert and the M340 and M580 controllers.

Severity
High
CVSS
7.5 (2.0)
Published
2020-01-06
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-863

Affected products

  • schneider-electric / ecostruxure_control_expert
  • schneider-electric / ecostruxure_control_expert / 14.1
  • schneider-electric / unity_pro
  • schneider-electric / modicon_m580_bmep584040_firmware
  • schneider-electric / modicon_m580_bmeh584040_firmware
  • schneider-electric / modicon_m580_bmep586040_firmware

Showing 6 representative product identities from 25 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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