CVE-2026-35227— Improper resource management in CODESYS Modbus TCP Server
Possible ATT&CK Techniques 1AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| CODESYS | CODESYS Modbus | 1.0.0.0< 4.6.0.0 | affected |
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I. Basic Information for CVE-2026-35227
Vulnerability Information
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Vulnerability Title
Improper resource management in CODESYS Modbus TCP Server
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
对已超过有效生命周期的资源丧失索引
Source: NVD (National Vulnerability Database)
Vulnerability Title
CODESYS Modbus TCP Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CODESYS Modbus TCP Server是德国CODESYS公司的一个提供工业设备 Modbus TCP 通信与数据交换能力的自动化控制组件。 CODESYS Modbus TCP Server存在安全漏洞，该漏洞源于连接处理中的竞争条件，可能导致未经身份验证的远程攻击者耗尽所有可用的TCP连接。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| CODESYS | CODESYS Modbus | 1.0.0.0 ~ 4.6.0.0 | - |
II. Public POCs for CVE-2026-35227
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same vendor: CODESYS
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CODESYS Installer TOCTOU Privilege Escalation - CVE-2025-41700
CODESYS Development System - Deserialization of Untrusted Da
Same weakness: CWE-772
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V. Comments for CVE-2026-35227
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