CVE-2026-35227 | BDVDB-2026-332521 Detail

CODESYSCODESYS Modbus

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.

Impact#

Per CVSS v4.0: confidentiality impact none, integrity impact none, availability impact high. Attack vector: network.

Weaknesses#

CWE-772 Missing Release of Resource after Effective Lifetime

References#

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

Exploit#

No public exploit known

History#

Version 12026-05-12Record published in the CVE List.
Version 22026-05-13Most recent update recorded in the CVE List.

Published

Published: 2026-05-12
Last modified: 2026-05-13

Vendor information

Vendor: CODESYS
Product: CODESYS Modbus

All CODESYS vulnerabilities

Score

8.2 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 29.0.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 1.0.0.0 and < 4.6.0.0
Fixed
4.6.0.0

Scoring System

CVSS v4.0

8.2 High

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Attack Requirements	Present
Privileges Required	None
User Interaction	None
Vulnerable System Confidentiality	None
Vulnerable System Integrity	None
Vulnerable System Availability	High
Subsequent System Confidentiality	None
Subsequent System Integrity	None
Subsequent System Availability	None

CVSS v3.1

Not available

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).