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CVE-2025-41658VulnerabilityPublished

CVE-2025-41658: CODESYS Runtime Toolkit · Incorrect Default Permissions

Affects CODESYS Runtime ToolkitSource CVE Database V5

0

Not known to be exploited · CVSS 5.5 Medium.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score
5.5Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 2% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 Aug 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

What to do

Affected software

ProductAffectedFixed in
CODESYS Runtime ToolkitAffected
  • =0.0.0.0
Fixed in–

AI-suggested

European organizations should immediately audit file permissions on systems running the CODESYS Runtime Toolkit to identify and restrict access to sensitive files. Implement strict access control policies ensuring that only authorized administrative users have read or write permissions to critical files. Employ host-based intrusion detection systems (HIDS) to monitor unauthorized access attempts to sensitive files. Limit the number of users with local access to industrial control systems and enforce the principle of least privilege. Use network segmentation to isolate industrial control systems from general IT networks, reducing the risk of lateral movement by attackers. Where possible, apply operating system-level hardening to enforce mandatory access controls (e.g., SELinux, AppArmor) to restrict file access beyond default permissions. Monitor logs for unusual local access patterns. Stay alert for vendor updates or patches addressing this vulnerability and plan for timely deployment once available. Additionally, conduct regular security awareness training for personnel with local access to industrial systems to reduce insider threat risks.

Description

CODESYS Runtime Toolkit-based products may expose sensitive files to local low-privileged operating system users due to default file permissions.

References

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