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Vulnerability record · CVE-2026-35227 · published 12 May 2026

CVE-2026-35227: An unauthenticated remote attacker may exhaust all available TCP connections in the 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.

8.2 CVSS 4.0 High EPSS 0.54% · top 56.6% CWE-772 · CWE-772 Awaiting Analysis
8.2CVSS 4.0 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

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.

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:

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

5.8CVE-2024-20481Cisco ASA and FTD RAVPN resource exhaustion denial of serviceCisco ASA and FTD Remote Access VPN services can be driven into resource exhaustion by a flood of VPN authentication requests. The flaw is a resource…KEVEPSS 16%analysed

Source: NIST National Vulnerability Database (record CVE-2026-35227), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.