What’s Vulnerable › Vulnerabilities

CVE-2020-6988

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-03-16 · updated 2026-06-17
• Weakness: CWE-603

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 products

• Rockwell Automation MicroLogix 1100: all versions
• Rockwellautomation Micrologix 1400 A Firmware: all versions
• Rockwellautomation Micrologix 1400 B Firmware: through 21.001
• Rockwell Automation RSLogix 500®: through 12.001

References

• https://www.us-cert.gov/ics/advisories/icsa-20-070-06
• https://www.us-cert.gov/ics/advisories/icsa-20-070-06

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