An unauthenticated remote attacker is able to exhaust all available TCP connections in the CODESYS EtherNet/IP adapter stack, preventing legitimate clients from establishing new connections.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

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.

No EPSS score available.

Exploitation none

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
CODESYS CODESYS EtherNetIP unaffected
Version Status Constraints
1.0.0.0 affected < 4.9.0.0

No data.

No data.

No data.

Project Subscriptions

Vendors Products
Codesys Subscribe
Codesys Ethernetip Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://codesys.csaf-tp.certvde.com/.well-known/csaf/white/2026/advisory2026-04_vde-2026-040.json cve-icon cve-icon
https://www.certvde.com/en/advisories/VDE-2026-040/ cve-icon cve-icon
History

Thu, 23 Apr 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 23 Apr 2026 15:00:00 +0000

Type Values Removed Values Added
Description An unauthenticated remote attacker is able to exhaust all available TCP connections in the CODESYS EtherNet/IP adapter stack, preventing legitimate clients from establishing new connections.
Title Improper timeout handling in CODESYS EtherNetIP
First Time appeared Codesys
Codesys codesys Ethernetip
Weaknesses CWE-754
CPEs cpe:2.3:a:codesys:codesys_ethernetip:*:*:*:*:*:*:*:*
Vendors & Products Codesys
Codesys codesys Ethernetip
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: CERTVDE

Published:

Updated: 2026-04-23T15:35:43.352Z

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

Link: CVE-2026-35225

cve-icon Vulnrichment

Updated: 2026-04-23T15:35:39.991Z

cve-icon NVD

Status : Received

Published: 2026-04-23T15:37:23.377

Modified: 2026-04-23T15:37:23.377

Link: CVE-2026-35225

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses