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CVE-2025-41659
A low-privileged attacker can remotely access the PKI folder of the CODESYS Control runtime system and thus read and write certificates and its keys. This allows sensitive data to be extracted or to accept certificates as trusted. Although all services remain available, only unencrypted communication is possible if the certificates are deleted.
This record: live connection— last retrieved: 9 November 2026 at 11:56.
Products
CODESYS Control RTE (SL), CODESYS Control RTE (for Beckhoff CX) SL, CODESYS Control Win (SL), CODESYS HMI (SL), CODESYS Runtime Toolkit, CODESYS Control for BeagleBone SL and 9 more
up to version <3.5.21.20
Published
4 August 2025
Last modified
17 June 2026
Taken directly from NVD, CISA or the vendor — sometimes in English, unchanged from the source.
A low-privileged attacker can remotely access the PKI folder of the CODESYS Control runtime system and thus read and write certificates and its keys. This allows sensitive data to be extracted or to accept certificates as trusted. Although all services remain available, only unencrypted communication is possible if the certificates are deleted.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
Attack vector
NETWORK
Privileges required
LOW
User interaction
NONE
Confidentiality
High
Integrity
High
Availability
Limited
Probability of exploitation within 30 days
0.3%
Percentile
18e
Source: FIRST.org, updated on 8 November 2026.
Update the following products to version 3.5.21.20. * CODESYS Control RTE (SL) * CODESYS Control RTE (for Beckhoff CX) SL * CODESYS Control Win (SL) * CODESYS HMI (SL) * CODESYS Runtime Toolkit The CODESYS Development System and the products available as CODESYS add-ons can be downloaded and installed directly with the CODESYS Installer or be downloaded from the CODESYS Store. Alternatively, as well as for all other products, you will find further information on obtaining the software update in the CODESYS Update area https://www.codesys.com/download/. Following our general recommendation that the PKI should only be managed via the dedicated X.509 API or the corresponding online services of the CODESYS Control runtime system, the programmatic direct access via SysFile or SysDir operations or online access via the CODESYS file transfer services is denied after an update to a fixed product version. For compatibility reasons, the old behavior can be restored for applications that use these accesses via the following setting: [CmpOpenSSL] EnforceBlacklistOnPKIDir=0 However, we strongly recommend keeping the new default.
Our own interpretation and context for the source data above.
IACS Radar assessment
Our own interpretation and context for this vulnerability — not an official source.
IACS Radar priority score
Based on CVSS 8.3, EPSS 0.3%, industrial relevance 40/100.
Combines CVSS, EPSS, KEV status, industrial relevance and exposure relevance — a complement to, not a replacement for, the individual scores below and above.
Conditions for exploitation
Operational impact & energy relevance
Limited impact on availability; the risk lies mainly with confidentiality or integrity of process data.
No strong energy-sector-specific signals recognised; general OT/ICS relevance.
Recommended defensive measures
Industrial relevance score
Classification is provisional; manual verification by an OT security analyst is recommended.
Classified by IACS Radar-analysepijplijn (geautomatiseerd) on 9 November 2026.
IEC 62443 mapping
Automatic IACS Radar assessment based on the reported CWE weakness classification; not an official certification statement.