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Vulnerability Details :

CVE-2026-35227

Assigner Org ID-270ccfa6-a436-4e77-922e-914ec3a9685c

Published At-12 May, 2026 | 07:14

Updated At-13 May, 2026 | 14:38

Improper resource management in CODESYS Modbus TCP Server

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.

EPSS History

Score

Latest Score

N/A

Percentile

Latest Percentile

N/A

▼Common Vulnerabilities and Exposures (CVE)

cve.org

Assigner:CERTVDE

Assigner Org ID:270ccfa6-a436-4e77-922e-914ec3a9685c

Published At:12 May, 2026 | 07:14

Updated At:13 May, 2026 | 14:38

▼CVE Numbering Authority (CNA)

Improper resource management in CODESYS Modbus TCP Server

Affected Products

Vendor

CODESYS GmbH

Product

CODESYS Modbus

Default Status

unaffected

Versions

Affected

From 1.0.0.0 before 4.6.0.0 (semver)

Problem Types

Type	CWE ID	Description
CWE	CWE-772	CWE-772 Missing Release of Resource after Effective Lifetime

Type: CWE

CWE ID: CWE-772

Description: CWE-772 Missing Release of Resource after Effective Lifetime

Metrics

Version	Base score	Base severity	Vector
4.0	8.2	HIGH	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

Version: 4.0

Base score: 8.2

Base severity: HIGH

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

Credits

finder

ABB Schweiz AG

References

Hyperlink	Resource
https://certvde.com/de/advisories/VDE-2026-042	N/A

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

Resource: N/A

▼Authorized Data Publishers (ADP)

CISA ADP Vulnrichment

Metrics Other Info

▼National Vulnerability Database (NVD)

nvd.nist.gov

Source:info@cert.vde.com

Published At:12 May, 2026 | 08:16

Updated At:12 May, 2026 | 14:15

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Secondary	4.0	8.2	HIGH	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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Type: Secondary

Version: 4.0

Base score: 8.2

Base severity: HIGH

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE ID	Type	Source
CWE-772	Primary	info@cert.vde.com

CWE ID: CWE-772

Type: Primary

Source: info@cert.vde.com

References

Hyperlink	Source	Resource
https://certvde.com/de/advisories/VDE-2026-042	info@cert.vde.com	N/A

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

Source: info@cert.vde.com

Resource: N/A

CVE-2026-35227

Credits

Improper resource management in CODESYS Modbus TCP Server

Vendors

Products

Metrics (CVSS)

Weaknesses

Attack Patterns

Solution/Workaround

References

EPSS History

Score

Latest Score

N/A

Percentile

Latest Percentile

N/A

Stakeholder-Specific Vulnerability Categorization (SSVC)

Affected Products

Affected

Problem Types

Metrics

Metrics Other Info

Impacts

Solutions

Configurations

Workarounds

Exploits

Credits

Timeline

Replaced By

Rejected Reason

References

Affected Products

Metrics

Metrics Other Info

Impacts

Solutions

Configurations

Workarounds

Exploits

Credits

Timeline

Replaced By

Rejected Reason

References

CISA Catalog

Metrics

CPE Matches

Weaknesses

Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References

Change History

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