high severity September 22, 2026 · 1 min read

CISA ICS Advisory: Siemens SIPLUS and SIMATIC Products

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

Multiple Siemens products are vulnerable to the "Copy Fail" vulnerability. Siemens has released new versions for several affected products and recommends to update to the latest versions. Siemens is preparing further fix versions and recommends specific countermeasures for products where fixes are not, or not yet available. The following versions of Siemens SIPLUS and SIMATIC Products are affected: SIMATIC AX Runtime Core Linux Common Debian vers:all/* (CVE-2026-31431)

CISA ICS Advisory: Siemens SIPLUS and SIMATIC Products

CISA has published an ICS advisory on September 22, 2026, warning that multiple Siemens SIPLUS and SIMATIC products contain a vulnerability known as “Copy Fail.”

Copy Fail vulnerability in Siemens runtime

The advisory describes a flaw in SIMATIC AX Runtime Core Linux Common Debian (all versions) tracked as CVE-2026-31431. Successful exploitation could allow an attacker to interfere with the copy operation of project data or configurations on affected industrial control systems.

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Affected products

The advisory names the following affected product line:

SIMATIC AX Runtime Core Linux Common Debian – all versions

Additional SIPLUS and SIMATIC products are also affected. Siemens has already released updated versions for several of them and is preparing fix versions for the remainder. The advisory does not state whether the vulnerability has been exploited in the wild.

What to do

Check whether any SIMATIC AX Runtime Core or related SIPLUS/SIMATIC systems in your environment are running the affected versions.
Apply the updated versions released by Siemens for all products where fixes are available.
For products without a fix yet, implement the specific countermeasures recommended in the advisory.
Monitor Siemens’ official product security channels for release of the remaining fix versions.
Follow CISA’s guidance on segmenting industrial control networks and limiting exposure of engineering workstations.

Organisations operating Siemens industrial automation equipment should treat this advisory as high priority for systems exposed to untrusted networks or used in safety-critical processes.

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Sources: CISA ICS Advisory

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