CVE-2026-35227

High

Published: 12 May 2026

Published

12 May 2026

Modified

12 May 2026

KEV Added

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Patch

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CVSS Score v4 8.2 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

EPSS Score 0.0035 27.1th percentile

Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-35227 is a high-severity Missing Release of Resource after Effective Lifetime (CWE-772) vulnerability in Certvde (inferred from references). Its CVSS base score is 8.2 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 27.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-29390

Vulnerability details

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.

CWE(s): CWE-772

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1499.004 Application or System Exploitation Impact

Adversaries may exploit software vulnerabilities that can cause an application or system to crash and deny availability to users.

attack.mitre.org →

Why these techniques?

The vulnerability description directly describes remote exploitation of a race condition leading to TCP connection exhaustion and denial of service to legitimate clients, mapping to application/system exploitation for endpoint DoS.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0