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EUVD-2026-174581

fkie_cve-2021-34596

A crafted request may cause a read access to an uninitialized pointer in CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56, resulting in a denial-of-service condition.

FSA-202601 — Several CODESYS vulnerabilities in Festo Automation Suite

Starting with Festo Automation Suite (FAS) version 2.8.0.138, the suite is delivered only with a connector to Codesys, rather than including Codesys directly. Prior to this version, Codesys was bundled within the FAS installation. From version 2.8.0.138 onwards, customers are required to download and install Codesys independently.

This change impacts the handling of security vulnerabilities (CVEs) related to Codesys. Any Codesys-related security issues must now be addressed by the customer through their separate Codesys installation. The FAS itself includes only the connector component, which is maintained and updated within the suite.

Please ensure that Codesys is kept up to date independently to mitigate any potential security risks associated with the Codesys software.

GHSA-93x3-2r5r-4375

A crafted request may cause a read access to an uninitialized pointer in CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56, resulting in a denial-of-service condition.

gsd-2021-34596

ICSA-26-076-01 — CODESYS in Festo Automation Suite

Please ensure that Codesys is kept up to date independently to mitigate any potential security risks associated with the Codesys software.

VDE-2021-054 — Pilz: Multiple vulnerabilities in CODESYS V2 and V3 runtime system

Several Pilz products use Versions V2 and V3 of the CODESYS runtime system from CODESYS GmbH, which enables the execution of IEC 61131-3 PLC programs. These runtime environments contain several vulnerabilities, which an attacker can exploit via the network. Successful exploitation of the vulnerabilities results in reduced availability and, in a worst case, to the insertion of program code.

VDE-2021-056 — WAGO: Multiple Vulnerabilities in CODESYS Runtime 2.3 and WebVisualisation

Multiple vulnerabilities were reported in CODESYS 2.3 Runtime. The CODESYS 2.3 Runtime is an essential component in several WAGO PLCs. All vulnerable PLCs are listed in chapter 'Affected Products'. https://www.codesys.com/security/security-reports.html