CVE intelligence and bounded remediation

CVE-2020-6984 — Rockwellautomation Micrologix 1400 A Firmware security vulnerability

Critical CVSS 9.8

Rockwell Automation MicroLogix 1400 Controllers Series B v21.001 and prior, Series A, all versions, MicroLogix 1100 Controller, all versions, RSLogix 500 Software v12.001 and prior, The cryptographic function utilized to protect the password in MicroLogix is discoverable.

Severity
Critical
CVSS
9.8 (3.1)
Published
2020-03-16
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-327

Affected products

  • rockwellautomation / micrologix_1400_a_firmware
  • rockwellautomation / micrologix_1400_b_firmware
  • rockwellautomation / micrologix_1100_firmware
  • rockwellautomation / rslogix_500

Matched remediation archetype

Cryptography, certificate, signature, and channel validation

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Inventory affected algorithms, key uses, trust stores, certificate validation settings, random sources, and plaintext channels across clients and services.
  • Determine which secrets, identities, signatures, or data protections depend on the affected primitive or validation path.
  • Check debug, compatibility, fallback, and hostname or audience override settings in build and runtime configuration.

Remediate safely

  • Use a maintained platform cryptographic API with approved algorithms, modes, parameters, randomness, and full peer identity validation.
  • Remove insecure fallback and validation bypasses; separate keys by purpose and load them from managed secret storage.
  • Plan rotation or reissuance for affected keys, certificates, tokens, hashes, or ciphertext and document compatibility sequencing.

Authoritative sources

Complete CVE record and remediation plan

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