CVE-2021-33012 Denial of service in Rockwell Automation MicroLogix 1100
Remote unauthenticated attackers can cause Rockwell MicroLogix 1100 PLCs to fault upon entering RUN mode, resulting in a denial-of-service condition.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-33012?
CVE-2021-33012 is a high-severity denial of service vulnerability in Rockwell Automation MicroLogix 1100, published on 9 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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: CWE-20
Which versions are affected by CVE-2021-33012?
It affects 1 product.
Products include Rockwellautomation Micrologix 1100 Firmware.
How do I fix CVE-2021-33012?
No fix has been published for CVE-2021-33012 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-33012 being exploited?
There is no known exploitation of CVE-2021-33012 in the wild and no public exploit code.
Other vulnerabilities in Rockwell Automation MicroLogix 1100
- CVE-2020-6984 Weak cryptography in Rockwell Automation MicroLogix 1400 Controllers Series B v21.001 and prior, Series A, all versions, MicroLogix 1100 Controller, all versions, RSLogix 500 Software v12.001 and prior
- CVE-2020-6990 Hardcoded credentials in Rockwell Automation MicroLogix 1400 Controllers Series B v21.001 and prior, Series A, all versions, MicroLogix 1100 Controller, all versions, RSLogix 500 Software v12.001 and prior
- CVE-2015-6490 Memory corruption in n/a
- CVE-2022-3166 MicroLogix 1100 & 1400 Product Web Server Application Vulnerable to Denial-Of-Service Condition Attack
- CVE-2020-6988 Information disclosure in Rockwell Automation MicroLogix 1400 Controllers Series B v21.001 and prior, Series A, all versions, MicroLogix 1100 Controller, all versions, RSLogix 500 Software v12.001 and prior
Sources
Also known as GHSA-m5fq-q49w-wc2j.