CVE-2020-6984

Name: CVE-2020-6984
Creator: NVD / NIST
Published: 2020-03-16T16:15:14.67+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.75%

Last modified Jun 17, 2026

CVE-2020-6984 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 2.75% chance of exploitation in the next 30 days.

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, The cryptographic function utilized to protect the password in MicroLogix is discoverable.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

2.75%

84.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Rockwellautomation	Micrologix 1400 A Firmware	All versions
Rockwellautomation	Micrologix 1400 B Firmware	<= 21.001
Rockwellautomation	Micrologix 1100 Firmware	All versions
Rockwellautomation	Rslogix 500	<= 12.001

References

https://www.us-cert.gov/ics/advisories/icsa-20-070-06Third Party Advisory, US Government Resource
https://www.us-cert.gov/ics/advisories/icsa-20-070-06Third Party Advisory, US Government Resource

Timeline

Published: Mar 16, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-6984?

How severe is CVE-2020-6984?

CVE-2020-6984 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.75% probability of exploitation in the next 30 days.

How do I fix CVE-2020-6984?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-6984?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST