medium severity August 27, 2026 · 1 min read

CISA ICS Advisory: Rockwell Automation OTTO Fleet Manager

Here’s what this advisory affects, and what to do about it.

Successful exploitation of this vulnerability could reduce the computational cost required for an attacker to perform offline brute-force attacks against stored password hashes.

CISA ICS Advisory: Rockwell Automation OTTO Fleet Manager

CISA published an ICS advisory on August 27, 2026, warning that a vulnerability in Rockwell Automation OTTO Fleet Manager could lower the effort required for offline brute-force attacks against stored password hashes.

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Reduced brute-force cost on password hashes

The advisory states that successful exploitation of the flaw could reduce the computational cost required for an attacker to perform offline brute-force attacks against stored password hashes. The advisory does not say whether the vulnerability has been exploited in the wild.

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Affected products

The vulnerability affects Rockwell Automation OTTO Fleet Manager. The advisory does not list specific version numbers or patch information in the provided details.

What to do

Determine whether your organisation uses Rockwell Automation OTTO Fleet Manager in any industrial control system or fleet management environment.
Consult the vendor’s official security guidance for this advisory and apply any available updates or mitigations.
Review password storage and hashing practices for OTTO Fleet Manager instances to limit exposure of hashes.
Monitor Rockwell Automation’s product security updates and CISA’s ICS advisories for further information on this issue.

Organisations operating industrial control systems should treat password hash protection as a priority in environments where OTTO Fleet Manager is deployed.

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Sources: CISA ICS Advisory

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