CVE-2026-35225

highpriority · track · 0EPSS 0.004 · 35 %ileDEEU
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.41% (35th) EPSS
CVSS 7.5 · high
Is it mine?
3 products
Check your exposure
Who says so?
3 sources
cnnvd · enisa_euvd · codesys_psirt

EPSS · scored 2026-10-27

An unauthenticated remote attacker is able to exhaust all available TCP connections in the CODESYS EtherNet/IP adapter stack, preventing legitimate clients from establishing new connections.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • FixedCODESYS EtherNetIPcodesys_psirt

    Update the following products to version 4.9.0.0. * CODESYS EtherNetIP To make the fix effective for existing CODESYS projects, you must additionally update the EtherNet/IP adapter in the device tree to the latest version and perform a download of the CODESYS application to the PLC. The CODESYS Development System and the products available as CODESYS add-ons can be downloaded and installed directly with the CODESYS Installer or be downloaded from the CODESYS Store. Alternatively, as well as for all other products, you will find further information on obtaining the software update in the CODESYS Update area https://www.codesys.com/download/.

02

cvss

Technical severity, 0–10. One row per scoring source.

8.7
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.6–8.7

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · CODESYS PSIRT
v4.08.7highCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:Nsecondary · ENISA EU
v4.08.7highCVSS:4.0/AV:N/AC:L/AT:N/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:Xsecondary · info@cert.vde.com
v4.06.6mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/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:Xsecondary · CVSS-BT (t0sche)
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-754USCWE-754US
05

affected products (3)

Products and version ranges known to be affected.

06

advisories (1)

Vendor and ecosystem advisories describing this.

  • Advisory2026-04_VDE-2026-040CODESYS EtherNetIP - Improper timeout handling2026-07-13csaf · codesys_psirtDE

    CODESYS EtherNet/IP is an add‑on for the CODESYS Development System that provides a fully integrated EtherNet/IP protocol stack along with diagnostic capabilities. A flaw in the EtherNet/IP adapter protocol stack library results in a vulnerability within the generated application code. When an EtherNet/IP adapter is configured, this vulnerable protocol stack is downloaded to and executed by CODESYS Control runtime systems. Under certain non‑standard operating conditions, the EtherNet/IP adapter fails to perform timeout checks on active TCP connections. As a result, once all available TCP connections are in use, expired connections are not released and no new TCP connections can be established. Existing connections remain unaffected and continue to operate normally. This issue affects only CODESYS projects that include an EtherNet/IP adapter configuration.

07

also known as (3)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdcodesys_psirtNVDCVE.orgMITRE
published 2026-04-23modified 2026-10-26
09

references (6)

External citations — patches, advisories, analysis.

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