CVE-2026-35227

Improper resource management in CODESYS Modbus TCP Server

Published May 12, 2026 CVSS 4.0 · 8.2 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Codesys codesys
Vendors & Products Codesys codesys
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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
CERTVDE
Published
Updated
May 13, 2026, 2:38 PM
Reserved
Apr 1, 2026, 7:54 PM
Status
Awaiting Analysis
Published
May 12, 2026, 8:16 AM
Modified
Oct 26, 2026, 6:10 PM