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CVE-2026-3509

CODESYS Control Audit Log Format String DoS

HIGH
7.5
CVSS Score
Published: March 24, 2026 at 07:42 AM UTC
Updated: June 17, 2026 at 10:43 AM UTC
15 products affected across 1 vendorControl for emPC-A/iMX6 SLControl for BeagleBone SLControl for PFC100 SL

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Severity
HIGH7.5
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Control for BeagleBone SL· Codesys
60%
4.1.0.0 ≤ v < 4.21.0.04.1.0.0
Affected range stops below 4.21.0.0, so it looks safe — our inference, not a vendor statement
Control for emPC-A/iMX6 SL· Codesys
60%
4.1.0.0 ≤ v < 4.21.0.04.1.0.0
Affected range stops below 4.21.0.0, so it looks safe — our inference, not a vendor statement
Control for IOT2000 SL· Codesys
60%
4.1.0.0 ≤ v < 4.21.0.04.1.0.0
Affected range stops below 4.21.0.0, so it looks safe — our inference, not a vendor statement
Control for Linux ARM SL· Codesys
60%
4.1.0.0 ≤ v < 4.21.0.04.1.0.0
Affected range stops below 4.21.0.0, so it looks safe — our inference, not a vendor statement
Control for Linux SL· Codesys
60%
4.1.0.0 ≤ v < 4.21.0.04.1.0.0
Affected range stops below 4.21.0.0, so it looks safe — our inference, not a vendor statement
Control for PFC100 SL· Codesys
60%
4.1.0.0 ≤ v < 4.21.0.04.1.0.0
Affected range stops below 4.21.0.0, so it looks safe — our inference, not a vendor statement
Control for PFC200 SL· Codesys
60%
4.1.0.0 ≤ v < 4.21.0.04.1.0.0
Affected range stops below 4.21.0.0, so it looks safe — our inference, not a vendor statement
Control for PLCnext SL· Codesys
60%
4.1.0.0 ≤ v < 4.21.0.04.1.0.0
Affected range stops below 4.21.0.0, so it looks safe — our inference, not a vendor statement
Control for Raspberry Pi SL· Codesys
60%
4.1.0.0 ≤ v < 4.21.0.04.1.0.0
Affected range stops below 4.21.0.0, so it looks safe — our inference, not a vendor statement
Control for WAGO Touch Panels 600 SL· Codesys
60%
4.1.0.0 ≤ v < 4.21.0.04.1.0.0
Affected range stops below 4.21.0.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: cverecord
https://certvde.com/de/advisories/VDE-2026-018

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCERTVDE
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-134

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