VULNERABILITY INTELLIGENCE

CVE-2021-33012

CVSS score8.6 HIGH

EPSS probability2.64%

CISA KEVNot currently listed

Published2021-07-09

Last modified2026-06-17

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

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.

Weakness classification

ics-cert@hq.dhs.gov: CWE-20
nvd@nist.gov: NVD-CWE-noinfo

Primary references

ics-cert@hq.dhs.gov — Third Party Advisory, US Government Resource
af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory, US Government Resource