CVE-2020-6990: rockwellautomation micrologix_1400_b_firmware Use of Hard-coded Cryptographic Key

Vulnerability summary

CVE-2020-6990 is a high (CVSS 10.0) Use of Hard-coded Cryptographic Key vulnerability in rockwellautomation micrologix_1400_b_firmware. EPSS estimates a 4.37% chance of exploitation in the next 30 days, higher than 91.2% of scored vulnerabilities.

Timeline

1. 16-03-2020
   PublishedVulnerability first disclosed.
2. 03-06-2026
   Last modifiedVulnerability information updated.

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 key utilized to help protect the account password is hard coded into the RSLogix 500 binary file. An attacker could identify cryptographic keys and use it for further cryptographic attacks that could ultimately lead to a remote attacker gaining unauthorized access to the controller.

• CWE-321Use of Hard-coded Cryptographic KeyThe product uses a hard-coded, unchangeable cryptographic key.
• CWE-798Use of Hard-coded CredentialsThe product contains hard-coded credentials, such as a password or cryptographic key.