EUVD-2026-29390
GHSA-qc33-pwh4-j9rq
CVSS VectorNVD
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
Lifecycle Timeline
5DescriptionNVD
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.
AnalysisAI
TCP connection exhaustion in CODESYS Modbus TCP Server allows remote unauthenticated attackers to trigger a race condition in connection handling, depleting all available TCP connections and denying service to legitimate industrial automation clients. CVSS 8.2 (High) reflects high availability impact. …
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RemediationAI
Within 24 hours: Identify all CODESYS Modbus TCP Server deployments and document current versions in use; assess network exposure (isolate affected systems from untrusted networks if possible pending patching). Within 7 days: Deploy vendor patch to upgrade all instances to version 4.6.0.0 or later; test patches in staging environment first, then execute across production systems on a scheduled maintenance window. …
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External POC / Exploit Code
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