A HIGH-severity vulnerability identified as CVE-2026-35227 has been published on May 12, 2026 with a CVSS base score of 8.2. 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-2026-35227
Severity: HIGH
CVSS Score: 8.2
Published: May 12, 2026
Weakness (CWE): CWE-772
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | None |
Technical Description
An unauthenticated remote attacker may exhaust all available TCP connections in the CODESYS Modbus TCP Server stack if a race condition in connection handling is successfully exploited, preventing legitimate clients from establishing new connections.
Potential Impact
If exploited, this high-severity vulnerability could allow an attacker to cause significant damage to affected systems. 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-2026-2993 — CVSS 7.5 (May 12, 2026) — HIGH / CVSS 7.5
- [HIGH] CVE-2026-43500 — CVSS 7.8 (May 11, 2026) — HIGH / CVSS 7.8
- [HIGH] CVE-2026-3828 — CVSS 7.2 (May 9, 2026) — HIGH / CVSS 7.2
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