CVE-2021-33012

8.6 HIGH
Published: July 09, 2021 Modified: June 03, 2026
View on NVD

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-189-01
Source: ics-cert@hq.dhs.gov
Third Party Advisory US Government Resource
https://us-cert.cisa.gov/ics/advisories/icsa-21-189-01
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory US Government Resource

2 reference(s) from NVD

Quick Stats

CVSS v3 Score
8.6 / 10.0
EPSS (Exploit Probability)
1.9%
78th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

rockwellautomation