CVE-2026-3509 | BDVDB-2026-322155 Detail

CODESYSCODESYS Control RTE (SL)

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.

Impact#

Per CVSS v3.1: confidentiality impact none, integrity impact none, availability impact high. Attack vector: network.

Weaknesses#

CWE-134 Use of Externally-Controlled Format String

References#

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

Exploit#

No public exploit known

History#

Version 12026-03-24Record published in the CVE List.
Version 22026-03-26Most recent update recorded in the CVE List.

Published

Published: 2026-03-24
Last modified: 2026-03-26

Vendor information

Vendor: CODESYS
Product: CODESYS Control RTE (SL)

All CODESYS vulnerabilities

Score

7.5 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 30.9.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Format String

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 3.5.17.0 and < 3.5.22.0
Fixed
3.5.22.0

Scoring System

CVSS v4.0

Not available

CVSS v3.1

7.5 High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	None
Integrity	None
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).