CVE-2026-35227

HIGH

Improper resource management in CODESYS Modbus TCP Server

Title source: cna

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.

References (1)

Core 1

Core References

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

Scores

CVSS v4 8.2

EPSS 0.0035

EPSS Percentile 26.8%

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-772

Status published

Products (1)

CODESYS/CODESYS Modbus 1.0.0.0 - 4.6.0.0

Published May 12, 2026

Tracked Since May 12, 2026