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Vulnerability · Published Mar 24, 2026 · Assigned by CERTVDE

CVE-2026-3509CODESYS Control Audit Log Format String DoS

High 7.5

In plain English

A high-severity security flaw in CODESYS Control for BeagleBone SL from CODESYS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.4%top 70.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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 (as reported)

VendorProductVersions
CODESYS CODESYS Control RTE (SL) 3.5.17.0 – before 3.5.22.0
CODESYS CODESYS Control RTE (for Beckhoff CX) SL 3.5.17.0 – before 3.5.22.0
CODESYS CODESYS Control Win (SL) 3.5.17.0 – before 3.5.22.0
CODESYS CODESYS Runtime Toolkit 3.5.17.0 – before 3.5.22.0
CODESYS CODESYS Control for BeagleBone SL 4.1.0.0 – before 4.21.0.0
CODESYS CODESYS Control for emPC-A/iMX6 SL 4.1.0.0 – before 4.21.0.0
CODESYS CODESYS Control for IOT2000 SL 4.1.0.0 – before 4.21.0.0
CODESYS CODESYS Control for Linux ARM SL 4.1.0.0 – before 4.21.0.0
CODESYS CODESYS Control for Linux SL 4.1.0.0 – before 4.21.0.0
CODESYS CODESYS Control for PFC100 SL 4.1.0.0 – before 4.21.0.0
CODESYS CODESYS Control for PFC200 SL 4.1.0.0 – before 4.21.0.0
CODESYS CODESYS Control for PLCnext SL 4.1.0.0 – before 4.21.0.0
CODESYS CODESYS Control for Raspberry Pi SL 4.1.0.0 – before 4.21.0.0
CODESYS CODESYS Control for WAGO Touch Panels 600 SL 4.1.0.0 – before 4.21.0.0
CODESYS CODESYS Virtual Control SL 4.1.0.0 – before 4.21.0.0

Weakness: CWE-134 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References