CVE-2025-41738: CODESYS Control - Invalid type usage in visualization

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-12-01 · updated 2026-06-17
Weakness: CWE-843

Description

An unauthenticated remote attacker may cause the visualisation server of the CODESYS Control runtime system to access a resource with a pointer of wrong type, potentially leading to a denial-of-service (DoS) condition.

Affected products

CODESYS Control for BeagleBone SL: from 4.5.0.0 before 4.19.0.0 — fixed in 4.19.0.0
CODESYS Control For Empc-A/Imx6 Sl: from 4.5.0.0 through 4.19.0.0
CODESYS Control for IOT2000 SL: from 4.5.0.0 before 4.19.0.0 — fixed in 4.19.0.0
CODESYS Control for Linux ARM SL: from 4.5.0.0 before 4.19.0.0 — fixed in 4.19.0.0
CODESYS Control for Linux SL: from 4.5.0.0 before 4.19.0.0 — fixed in 4.19.0.0
CODESYS Control for PFC100 SL: from 4.5.0.0 through 4.19.0.0
CODESYS Control for PFC200 SL: from 4.5.0.0 before 4.19.0.0 — fixed in 4.19.0.0
CODESYS Control for PLCnext SL: from 4.5.0.0 before 4.19.0.0 — fixed in 4.19.0.0
CODESYS Control for Raspberry Pi SL: from 4.5.0.0 before 4.19.0.0 — fixed in 4.19.0.0
CODESYS Control for WAGO Touch Panels 600 SL: from 4.5.0.0 through 4.19.0.0
CODESYS Control RTE (SL): from 3.5.18.0 before 3.5.21.40 — fixed in 3.5.21.40
CODESYS Control Rte Sl (For Beckhoff Cx): from 3.5.18.0 before 3.5.21.40 — fixed in 3.5.21.40
CODESYS Control Win (SL): from 3.5.18.0 before 3.5.21.40 — fixed in 3.5.21.40
CODESYS HMI (SL): from 3.5.18.0 before 3.5.21.40 — fixed in 3.5.21.40
CODESYS Remote Target Visu: from 3.5.18.0 before 3.5.21.40 — fixed in 3.5.21.40
CODESYS Runtime Toolkit: from 3.5.18.0 before 3.5.21.40 — fixed in 3.5.21.40
CODESYS Virtual Control SL: from 4.5.0.0 before 4.19.0.0 — fixed in 4.19.0.0

How to fix

Upgrade to a fixed version: CODESYS Control for BeagleBone SL 4.19.0.0; CODESYS Control for IOT2000 SL 4.19.0.0; CODESYS Control for Linux ARM SL 4.19.0.0; CODESYS Control for Linux SL 4.19.0.0; CODESYS Control for PFC200 SL 4.19.0.0; CODESYS Control for PLCnext SL 4.19.0.0; CODESYS Control for Raspberry Pi SL 4.19.0.0; CODESYS Control RTE (SL) 3.5.21.40; CODESYS Control Rte Sl (For Beckhoff Cx) 3.5.21.40; CODESYS Control Win (SL) 3.5.21.40; CODESYS HMI (SL) 3.5.21.40; CODESYS Remote Target Visu 3.5.21.40. Check the vendor advisory for mitigations.

References

https://certvde.com/de/advisories/VDE-2025-100

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