CVE-2023-37557: CODESYS Heap-based Buffer Overflow in multiple products

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-08-03 · updated 2026-06-17
Weakness: CWE-787

Description

After successful authentication as a user in multiple Codesys products in multiple versions, specific crafted remote communication requests can cause the CmpAppBP component to overwrite a heap-based buffer, which can lead to a denial-of-service condition.

Affected products

CODESYS Control for BeagleBone SL: before 4.10.0.0 — fixed in 4.10.0.0
CODESYS Control For Empc-A/Imx6 Sl: before 4.10.0.0 — fixed in 4.10.0.0
CODESYS Control for IOT2000 SL: before 4.10.0.0 — fixed in 4.10.0.0
CODESYS Control for Linux SL: before 4.10.0.0 — fixed in 4.10.0.0
CODESYS Control for PFC100 SL: before 4.10.0.0 — fixed in 4.10.0.0
CODESYS Control for PFC200 SL: before 4.10.0.0 — fixed in 4.10.0.0
CODESYS Control for PLCnext SL: before 4.10.0.0 — fixed in 4.10.0.0
CODESYS Control for Raspberry Pi SL: before 4.10.0.0 — fixed in 4.10.0.0
CODESYS Control for WAGO Touch Panels 600 SL: before 4.10.0.0 — fixed in 4.10.0.0
CODESYS Control RTE (SL): before 3.5.19.20 — fixed in 3.5.19.20
CODESYS Control Rte Sl (For Beckhoff Cx): before 3.5.19.20 — fixed in 3.5.19.20
CODESYS Control Runtime System Toolkit: before 3.5.19.20 — fixed in 3.5.19.20
CODESYS Control Win (SL): before 3.5.19.20 — fixed in 3.5.19.20
CODESYS Development System: before 3.5.19.20 — fixed in 3.5.19.20
CODESYS Hmi: before 3.5.19.20 — fixed in 3.5.19.20
CODESYS Safety SIL2: before 3.5.19.20 — fixed in 3.5.19.20

How to fix

Upgrade to a fixed version: CODESYS Control for BeagleBone SL 4.10.0.0; CODESYS Control For Empc-A/Imx6 Sl 4.10.0.0; CODESYS Control for IOT2000 SL 4.10.0.0; CODESYS Control for Linux SL 4.10.0.0; CODESYS Control for PFC100 SL 4.10.0.0; CODESYS Control for PFC200 SL 4.10.0.0; CODESYS Control for PLCnext SL 4.10.0.0; CODESYS Control for Raspberry Pi SL 4.10.0.0; CODESYS Control for WAGO Touch Panels 600 SL 4.10.0.0; CODESYS Control RTE (SL) 3.5.19.20; CODESYS Control Rte Sl (For Beckhoff Cx) 3.5.19.20; CODESYS Control Runtime System Toolkit 3.5.19.20. Check the vendor advisory for mitigations.

References

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