CVE-2026-35227 HIGH

CVE-2026-35227: Improper resource management in CODESYS Modbus TCP Server

Vendor Codesys
Product CODESYS Modbus
Weakness CWE-772
Published May 12, 2026
Last update May 13, 2026
View on NVD All CVEs

CVSS base score

8.2/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 12, 2026 CVE published
May 13, 2026 Record updated