CVE-2021-33012

8.6 highEPSS 2.6%

High (8.6) in rockwellautomation micrologix 1100 firmware. EPSS 2.6% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

8.6 high

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

EPSS: 2.6% chance of exploitation in the next 30 days; higher than 85% of CVEs (scores of 2026-10-31)
CWE: CWE-20
Published: 2021-07-09
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

rockwellautomation:micrologix_1100_firmware

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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