CVE-2026-3509: Codesys Control For Beaglebone Sl

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

An unauthenticated remote attacker may be able to control the format string of messages processed by the Audit Log of the CODESYS Control runtime system, potentially resulting in a denial‑of‑service (DoS) condition.

Affected products

Codesys Codesys Control For Beaglebone Sl: from 4.1.0.0, before 4.21.0.0 (fixed in 4.21.0.0)
Codesys Codesys Control For Empc-a/imx6 Sl: from 4.1.0.0, before 4.21.0.0 (fixed in 4.21.0.0)
Codesys Codesys Control For IOT2000 Sl: from 4.1.0.0, before 4.21.0.0 (fixed in 4.21.0.0)
Codesys Codesys Control For Linux Arm Sl: from 4.1.0.0, before 4.21.0.0 (fixed in 4.21.0.0)
Codesys Codesys Control For Linux Sl: from 4.1.0.0, before 4.21.0.0 (fixed in 4.21.0.0)
Codesys Codesys Control For PFC100 Sl: from 4.1.0.0, before 4.21.0.0 (fixed in 4.21.0.0)
Codesys Codesys Control For PFC200 Sl: from 4.1.0.0, before 4.21.0.0 (fixed in 4.21.0.0)
Codesys Codesys Control For Plcnext Sl: from 4.1.0.0, before 4.21.0.0 (fixed in 4.21.0.0)
Codesys Codesys Control For Raspberry Pi Sl: from 4.1.0.0, before 4.21.0.0 (fixed in 4.21.0.0)
Codesys Codesys Control For Wago Touch Panels 600 Sl: from 4.1.0.0, before 4.21.0.0 (fixed in 4.21.0.0)
Codesys Codesys Control Rte For Beckhoff Cx Sl: from 3.5.17.0, before 3.5.22.0 (fixed in 3.5.22.0)
Codesys Codesys Control Rte Sl: from 3.5.17.0, before 3.5.22.0 (fixed in 3.5.22.0)
Codesys Codesys Control Win Sl: from 3.5.17.0, before 3.5.22.0 (fixed in 3.5.22.0)
Codesys Codesys Runtime Toolkit: from 3.5.17.0, before 3.5.22.0 (fixed in 3.5.22.0)
Codesys Codesys Virtual Control Sl: from 4.1.0.0, before 4.21.0.0 (fixed in 4.21.0.0)

Published 2026-03-24. Last modified 2026-06-17.