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.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Codesys
  • Codesys Modbus

No data.

No data.

References
Link Providers
https://certvde.com/de/advisories/VDE-2026-042 cve-icon cve-icon
History

Tue, 12 May 2026 07:30:00 +0000

Type Values Removed Values Added
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.
Title Improper resource management in CODESYS Modbus TCP Server
First Time appeared Codesys
Codesys codesys Modbus
Weaknesses CWE-772
CPEs cpe:2.3:a:codesys:codesys_modbus:*:*:*:*:*:*:*:*
Vendors & Products Codesys
Codesys codesys Modbus
References
Metrics cvssV4_0

{'score': 8.2, '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'}
cve-icon MITRE

Status: PUBLISHED

Assigner: CERTVDE

Published:

Updated: 2026-05-12T07:14:41.517Z

Reserved: 2026-04-01T19:54:21.499Z

Link: CVE-2026-35227

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-12T08:16:08.193

Modified: 2026-05-12T08:16:08.193

Link: CVE-2026-35227

cve-icon Redhat

No data.