high severity September 01, 2026 · 1 min read

CISA ICS Advisory: Rockwell Automation Historian ME

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

This organization is reported to have suffered a high-severity data breach. Full verified details will be added here as they are confirmed.

CISA ICS Advisory: Rockwell Automation Historian ME

CISA published an ICS advisory on September 1, 2026, warning that two vulnerabilities in Rockwell Automation Historian ME could allow an attacker to crash the device or achieve remote code execution.

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Out-of-bounds write and device crash

The advisory describes two flaws in the affected product. Successful exploitation of these vulnerabilities could crash the device being accessed. One of the issues is an out-of-bounds write condition that may allow remote code execution. The advisory does not state whether the vulnerabilities have been exploited in the wild.

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Affected products

The advisory identifies the following versions as affected:

Rockwell Automation Historian ME Series B 5.202

No other versions or products are named.

What to do

Determine whether Series B 5.202 of Historian ME is in use in your environment.
Apply the update or mitigation steps provided by Rockwell Automation for these vulnerabilities.
Follow the specific recommendations listed in the CISA advisory, including any compensating controls for systems that cannot be immediately updated.
Monitor Rockwell Automation’s official channels for additional patches or guidance.
Review and restrict network access to Historian ME systems in line with ICS best practices.

Organisations operating industrial control systems should prioritise vendor-supplied fixes for these vulnerabilities to reduce the risk of denial of service or remote code execution on affected devices.

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Sources: CISA ICS Advisory

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