What’s Vulnerable › Vulnerabilities

CVE-2021-33012

• Severity: high (CVSS 8.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-07-09 · updated 2026-06-17
• Weakness: CWE-20

Description

Rockwell Automation MicroLogix 1100, all versions, allows a remote, unauthenticated attacker sending specially crafted commands to cause the PLC to fault when the controller is switched to RUN mode, which results in a denial-of-service condition. If successfully exploited, this vulnerability will cause the controller to fault whenever the controller is switched to RUN mode.

Affected products

• Rockwell Automation MicroLogix 1100: all versions

References

• https://us-cert.cisa.gov/ics/advisories/icsa-21-189-01
• https://us-cert.cisa.gov/ics/advisories/icsa-21-189-01

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