CVE-2026-79625: Improper Synchronization in Monitoring in CODESYS Control Runtime

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-30 · updated 2026-09-30
Weakness: CWE-362

Description

Affected products do not properly synchronize access to their monitoring functionality. When multiple clients send concurrent requests, this may lead to incorrect reads or writes, or to corruption of internal memory structures. An authenticated remote attacker with monitoring access can exploit this issue to cause incorrect data processing or a denial-of-service condition.

Affected products

CODESYS Control for BeagleBone SL: from 3.5.0.0 before 4.23.0.0 — fixed in 4.23.0.0
CODESYS Control for emPC-A/iMX6 SL: from 3.5.0.0 before 4.23.0.0 — fixed in 4.23.0.0
CODESYS Control for IOT2000 SL: from 3.5.0.0 before 4.23.0.0 — fixed in 4.23.0.0
CODESYS Control for Linux ARM SL: from 3.5.0.0 before 4.23.0.0 — fixed in 4.23.0.0
CODESYS Control for Linux SL: from 3.5.0.0 before 4.23.0.0 — fixed in 4.23.0.0
CODESYS Control for PFC100 SL: from 3.5.0.0 before 4.23.0.0 — fixed in 4.23.0.0
CODESYS Control for PFC200 SL: from 3.5.0.0 before 4.23.0.0 — fixed in 4.23.0.0
CODESYS Control for PLCnext SL: from 3.5.0.0 before 4.23.0.0 — fixed in 4.23.0.0
CODESYS Control for Raspberry Pi SL: from 3.5.0.0 before 4.23.0.0 — fixed in 4.23.0.0
CODESYS Control for WAGO Touch Panels 600 SL: from 3.5.0.0 before 4.23.0.0 — fixed in 4.23.0.0
CODESYS Control RTE (for Beckhoff CX) SL: from 3.0.0.0 before 3.5.22.40 — fixed in 3.5.22.40
CODESYS Control RTE (SL): from 3.0.0.0 before 3.5.22.40 — fixed in 3.5.22.40
CODESYS Control Win (SL): from 3.0.0.0 before 3.5.22.40 — fixed in 3.5.22.40
CODESYS Development System 3: from 3.0.0.0 before 3.5.22.40 — fixed in 3.5.22.40
CODESYS HMI (SL): from 3.0.0.0 before 3.5.22.40 — fixed in 3.5.22.40
CODESYS Runtime Toolkit: from 3.0.0.0 before 3.5.22.40 — fixed in 3.5.22.40
CODESYS Safety SIL2: from 3.0.0.0 before 3.5.22.40 — fixed in 3.5.22.40
CODESYS Virtual Control SL: from 3.5.0.0 before 4.23.0.0 — fixed in 4.23.0.0

How to fix

Upgrade to a fixed version: CODESYS Control for BeagleBone SL 4.23.0.0; CODESYS Control for emPC-A/iMX6 SL 4.23.0.0; CODESYS Control for IOT2000 SL 4.23.0.0; CODESYS Control for Linux ARM SL 4.23.0.0; CODESYS Control for Linux SL 4.23.0.0; CODESYS Control for PFC100 SL 4.23.0.0; CODESYS Control for PFC200 SL 4.23.0.0; CODESYS Control for PLCnext SL 4.23.0.0; CODESYS Control for Raspberry Pi SL 4.23.0.0; CODESYS Control for WAGO Touch Panels 600 SL 4.23.0.0; CODESYS Control RTE (for Beckhoff CX) SL 3.5.22.40; CODESYS Control RTE (SL) 3.5.22.40. Check the vendor advisory for mitigations.

References

https://www.certvde.com/en/advisories/VDE-2026-097/

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