A HIGH-severity vulnerability identified as CVE-2026-3509 has been published on March 24, 2026 with a CVSS base score of 7.5. This security advisory provides a detailed breakdown of the vulnerability, its potential impact, weakness classification, and actionable steps to protect your systems.
Vulnerability Details
CVE ID: CVE-2026-3509
Severity: HIGH
CVSS Score: 7.5
Published: March 24, 2026
Weakness (CWE): CWE-134
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | None |
| Confidentiality Impact | None |
| Integrity Impact | None |
| Availability Impact | High |
Technical 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.
Potential Impact
If exploited, this high-severity vulnerability could allow an attacker to cause a denial of service. Organizations running affected software should treat this as a priority remediation item.
Recommended Action
No official patch is available yet. Until one is released:
- Monitor the official NVD page and vendor channels for patch announcements.
- Restrict access to the affected system or service where possible.
- Apply network-level mitigations such as firewall rules or WAF policies.
- Enable logging and alerting for anomalous activity related to this vulnerability.
- Review your incident response plan in case of active exploitation.
References
Related Security Advisories
- [HIGH] CVE-2026-4579 — CVSS 7.3 (March 23, 2026) — HIGH / CVSS 7.3
- [HIGH] CVE-2026-4540 — CVSS 7.3 (March 22, 2026) — HIGH / CVSS 7.3
- [HIGH] CVE-2026-25471 — CVSS 8.1 (March 19, 2026) — HIGH / CVSS 8.1
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