CVE-2026-35227

Improper resource management in CODESYS Modbus TCP Server

CVSS 8.2 HIGHEPSS 0.4%CWE-772

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 8.2EPSS 0.4%KEV nãoPoC —Patch —

Lifecycle

12 May 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Affected products

CODESYS · CODESYS Modbus

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References

https://certvde.com/de/advisories/VDE-2026-042