CVE-2021-33012
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.64%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.6 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- EPSS
- 2.64% probability · 85th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- rockwellautomation/micrologix 1100 firmware
- Source
- ics-cert@hq.dhs.gov
References
- https://us-cert.cisa.gov/ics/advisories/icsa-21-189-01Third Party Advisory, US Government Resource
- https://us-cert.cisa.gov/ics/advisories/icsa-21-189-01Third Party Advisory, US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.