CVE-2020-6988

HIGH
7.5
CVSS Score
Published: March 16, 2020 at 03:38 PM UTC
Updated: June 17, 2026 at 03:24 AM UTC
8 products affected across 1 vendorMicrologix 1400-b FirmwareMicrologix 1100 FirmwareMicrologix 1400-a Firmware

Using 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 by N/A?

Get instant alerts when new vulnerabilities affect 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 - before attackers find them.

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Severity
HIGH7.5
Exploit prediction
EPSS 4%
SSVC
No known exploit

Description

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, A remote, unauthenticated attacker can send a request from the RSLogix 500 software to the victim’s MicroLogix controller. The controller will then respond to the client with used password values to authenticate the user on the client-side. This method of authentication may allow an attacker to bypass authentication altogether, disclose sensitive information, or leak credentials.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions
rockwellautomation-micrologix-1100 (same device)
All versions
rockwellautomation-micrologix-1400 (same device)
v ≤ 21.001
rockwellautomation-micrologix-1400 (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_MISCThird Party AdvisoryUS Government Resource
https://www.us-cert.gov/ics/advisories/icsa-20-070-06

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-603CWE-287

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