What’s Vulnerable › Vulnerabilities
CVE-2026-35227: Improper resource management in CODESYS Modbus TCP Server
- Severity: high (CVSS 8.2 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-12 · updated 2026-10-26
- Weakness: CWE-772
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.
Affected products
- CODESYS Modbus: from 1.0.0.0 before 4.6.0.0 — fixed in 4.6.0.0
How to fix
Upgrade to a fixed version: CODESYS Modbus 4.6.0.0. Check the vendor advisory for mitigations.
References
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