CVE-2021-29241

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-05-03 · updated 2026-06-17
Weakness: CWE-476

Description

CODESYS Gateway 3 before 3.5.16.70 has a NULL pointer dereference that may result in a denial of service (DoS).

Affected products

CODESYS Control for BeagleBone SL: from 3.0 before 4.0.1.0 — fixed in 4.0.1.0
CODESYS Control For Empc-A/Imx6 Sl: from 3.0 before 4.0.1.0 — fixed in 4.0.1.0
CODESYS Control for IOT2000 SL: from 3.0 before 4.0.1.0 — fixed in 4.0.1.0
CODESYS Control for Linux SL: from 3.0 before 4.0.1.0 — fixed in 4.0.1.0
CODESYS Control for PFC100 SL: from 3.0 before 3.5.16.0 — fixed in 3.5.16.0
CODESYS Control for PFC200 SL: from 3.0 before 3.5.16.0 — fixed in 3.5.16.0
CODESYS Control for Raspberry Pi SL: from 3.0 before 4.0.1.0 — fixed in 4.0.1.0
CODESYS Control Runtime System Toolkit: from 3.0 before 3.5.16.70 — fixed in 3.5.16.70
CODESYS Development System: from 3.0 before 3.5.16.70 — fixed in 3.5.16.70
CODESYS Edge Gateway: from 3.0 before 3.5.16.70; from 3.0 before 4.1.0.0 — fixed in 3.5.16.70, 4.1.0.0
CODESYS Gateway Server V2: from 3.0 before 3.5.16.70 — fixed in 3.5.16.70

How to fix

Upgrade to a fixed version: CODESYS Control for BeagleBone SL 4.0.1.0; CODESYS Control For Empc-A/Imx6 Sl 4.0.1.0; CODESYS Control for IOT2000 SL 4.0.1.0; CODESYS Control for Linux SL 4.0.1.0; CODESYS Control for PFC100 SL 3.5.16.0; CODESYS Control for PFC200 SL 3.5.16.0; CODESYS Control for Raspberry Pi SL 4.0.1.0; CODESYS Control Runtime System Toolkit 3.5.16.70; CODESYS Development System 3.5.16.70; CODESYS Edge Gateway 3.5.16.70, 4.1.0.0; CODESYS Gateway Server V2 3.5.16.70. Check the vendor advisory for mitigations.

References

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