high severity September 01, 2026 · 1 min read

CISA ICS Advisory: Rockwell Automation RSLinx Classic

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

Successful exploitation of these vulnerabilities could allow an attacker to cause a denial-of-service condition on the affected product.

CISA ICS Advisory: Rockwell Automation RSLinx Classic

On September 1, 2026, the Cybersecurity and Infrastructure Security Agency (CISA) released an ICS advisory detailing vulnerabilities in Rockwell Automation RSLinx Classic.

Denial-of-service via crafted messages

The advisory states that successful exploitation of the vulnerabilities could allow an attacker to cause a denial-of-service condition on the affected product. The advisory does not say whether the flaws have been exploited in the wild.

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Affected products

The vulnerabilities affect specific versions of Rockwell Automation RSLinx Classic. The advisory provides details on the impacted versions and does not name any specific end-user organisations or sectors beyond those typically using industrial control system software.

What to do

Determine whether any instances of RSLinx Classic in your environment are running the affected versions.
Apply the update or mitigation steps provided by Rockwell Automation for the identified vulnerabilities.
Implement network segmentation and access controls that limit exposure of the affected product to untrusted networks.
Monitor Rockwell Automation’s official channels for any additional guidance or patches.
Review and follow all recommendations listed in the CISA ICS advisory.

Organisations operating industrial control systems should prioritise vendor updates for components such as RSLinx Classic to reduce the risk of denial-of-service impacts.

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Sources: CISA ICS Advisory

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