Rockwell Automation Arena Simulation Siman expmt.exe out-of-bounds write

Summaryinfo

A vulnerability categorized as problematic has been discovered in Rockwell Automation Arena Simulation. Affected by this issue is some unknown functionality of the file expmt.exe of the component Siman. Such manipulation leads to out-of-bounds write. This vulnerability is uniquely identified as CVE-2026-8312. Local access is required to approach this attack. No exploit exists.

Detailsinfo

A vulnerability was found in Rockwell Automation Arena Simulation (affected version unknown) and classified as problematic. Affected by this issue is an unknown functionality of the file expmt.exe of the component Siman. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A security issue exists within Arena® Simulation due to a memory corruption vulnerability in the expmt.exe (Siman) component. The vulnerability stems from improper validation of user-supplied data, which can result in an out-of-bounds write. An attacker could leverage this vulnerability to execute arbitrary code in the context of the current process by convincing a user to open a malicious file.

The advisory is available at rockwellautomation.com. This vulnerability is handled as CVE-2026-8312 since 05/11/2026. The exploitation is known to be easy. Local access is required to approach this attack. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 07/14/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Automation Software

Vendor

• Rockwell Automation

Name

• Arena Simulation

License

• commercial

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