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ICS Advisories
Advisories specifically aimed at industrial control systems — from CISA ICS-CERT and directly from vendors (including Siemens, ABB, Schneider Electric, WAGO and Phoenix Contact) — including revision history (initial publication, Update A, Update B) and linked CVEs.
1
Found
Advisory data: live connection— last retrieved: 7 November 2026 at 01:34.
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Advisory2026-11_VDE-2026-094
CODESYS Gateway Client - Uncontrolled Memory Allocation
Risk evaluation
The CODESYS Gateway Client (CmpGwClient) is used by various CODESYS products to establish PLC communication via the CODESYS Gateway. Due to missing limits on memory allocations derived from a size field in a gateway response, a malicious gateway can cause excessive memory consumption in the client, resulting in a denial-of-service condition. The vulnerability can be exploited when an affected product connects to an attacker-controlled gateway.
Mitigation summary
Update the following products to version 3.5.22.40. * CODESYS Development System 3 * CODESYS Gateway * CODESYS Edge Gateway for Windows * CODESYS HMI (SL) * CODESYS OPC DA Server SL * CODESYS PLCHandler * CODESYS Runtime Toolkit The CODESYS Development System and the products available as CODESYS add-ons can be downloaded and installed directly with the CODESYS Installer or be downloaded from the CODESYS Store. Alternatively, as well as for all other products, you will find further information on obtaining the software update in the CODESYS Update area https://www.codesys.com/download/.
Revision history (2)
Initial publication — 30 September 2026
Initial revision.
Update A — 22 October 2026
Updated remediation category - fixed SL runtimes are now available, updated summary - typo corrected, formal adaptions.