CVE-2025-9042 Rockwell Automation FLEX 5000 I/O - Module Fault
Improper handling of CIP requests causes the 5094-IY8 module to fault and require a power cycle, disrupting industrial operations.
- 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-2025-9042?
CVE-2025-9042 is a high-severity denial of service vulnerability in Rockwell Automation FLEX 5000 I/O, published on 14 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A security issue exists due to improper handling of CIP Class 32’s request when a module is inhibited on the 5094-IY8 device. It causes the module to enter a fault state with the Module LED flashing red. Upon un-inhibiting, the module returns a connection fault (Code 16#0010), and the module cannot recover without a power cycle.
Weakness: CWE-1287
Which versions are affected by CVE-2025-9042?
How do I fix CVE-2025-9042?
No fix has been published for CVE-2025-9042 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-2025-9042 being exploited?
There is no known exploitation of CVE-2025-9042 in the wild and no public exploit code.
Sources
Also known as GHSA-2f8x-992w-8mjc.