CVE-2023-38744

highpriority · track · 30EPSS 0.009 · 59 %ileEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.87% (59th) EPSS

CVSS 7.5 · high

Is it mine?

16 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-28

Denial-of-service (DoS) vulnerability due to improper validation of specified type of input issue exists in the built-in EtherNet/IP port of the CJ Series CJ2 CPU unit and the communication function of the CS/CJ Series EtherNet/IP unit. If an affected product receives a packet which is specially crafted by a remote unauthenticated attacker, the unit of the affected product may fall into a denial-of-service (DoS) condition. Affected products/versions are as follows: CJ2M CPU Unit CJ2M-CPU3[] Unit version of the built-in EtherNet/IP section Ver. 2.18 and earlier, CJ2H CPU Unit CJ2H-CPU6[]-EIP Unit version of the built-in EtherNet/IP section Ver. 3.04 and earlier, CS/CJ Series EtherNet/IP Unit CS1W-EIP21 V3.04 and earlier, and CS/CJ Series EtherNet/IP Unit CJ1W-EIP21 V3.04 and earlier.

cvss

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

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

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

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

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-1284US

affected products (16)

Products and version ranges known to be affected.

OMRON Corporation CJ2H CPU Unit≤ CJ2H-CPU6[]-EIP Unit version of the built-in EtherNet/IP section Ver. 3.04 and earlierenisa_euvdEU
OMRON Corporation CJ2M CPU Unit≤ CJ2M-CPU3[] Unit version of the built-in EtherNet/IP section Ver. 2.18 and earlierenisa_euvdEU
OMRON Corporation CS/CJ Series EtherNet/IP Unit≤ CS1W-EIP21 V3.04 and earlierenisa_euvdEU
OMRON Corporation CS/CJ Series EtherNet/IP Unit≤ CJ1W-EIP21 V3.04 and earlierenisa_euvdEU
omron cj1w-eip21 firmware≤ 3.04nvdUScpe:2.3:o:omron:cj1w-eip21_firmware:*:*:*:*:*:*:*:*
omron cj2h-cpu64-eip firmware≤ 3.04nvdUScpe:2.3:o:omron:cj2h-cpu64-eip_firmware:*:*:*:*:*:*:*:*
omron cj2h-cpu65-eip firmware≤ 3.04nvdUScpe:2.3:o:omron:cj2h-cpu65-eip_firmware:*:*:*:*:*:*:*:*
omron cj2h-cpu66-eip firmware≤ 3.04nvdUScpe:2.3:o:omron:cj2h-cpu66-eip_firmware:*:*:*:*:*:*:*:*
omron cj2h-cpu67-eip firmware≤ 3.04nvdUScpe:2.3:o:omron:cj2h-cpu67-eip_firmware:*:*:*:*:*:*:*:*
omron cj2h-cpu68-eip firmware≤ 3.04nvdUScpe:2.3:o:omron:cj2h-cpu68-eip_firmware:*:*:*:*:*:*:*:*
omron cj2m-cpu31 firmware≤ 2.18nvdUScpe:2.3:o:omron:cj2m-cpu31_firmware:*:*:*:*:*:*:*:*
omron cj2m-cpu32 firmware≤ 2.18nvdUScpe:2.3:o:omron:cj2m-cpu32_firmware:*:*:*:*:*:*:*:*
omron cj2m-cpu33 firmware≤ 2.18nvdUScpe:2.3:o:omron:cj2m-cpu33_firmware:*:*:*:*:*:*:*:*
omron cj2m-cpu34 firmware≤ 2.18nvdUScpe:2.3:o:omron:cj2m-cpu34_firmware:*:*:*:*:*:*:*:*
omron cj2m-cpu35 firmware≤ 2.18nvdUScpe:2.3:o:omron:cj2m-cpu35_firmware:*:*:*:*:*:*:*:*
omron cs1w-eip21 firmware≤ 3.04nvdUScpe:2.3:o:omron:cs1w-eip21_firmware:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2023-08-03modified 2026-06-17

references (8)

External citations — patches, advisories, analysis.

scry

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