CVE-2023-38744

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-1284

Affected software

Vendor	Product	Versions
OMRON Corporation	CJ2M CPU Unit	CJ2M-CPU3[] Unit version of the built-in EtherNet/IP section Ver. 2.18 and earlier
OMRON Corporation	CJ2H CPU Unit	CJ2H-CPU6[]-EIP Unit version of the built-in EtherNet/IP section Ver. 3.04 and earlier
OMRON Corporation	CS/CJ Series EtherNet/IP Unit	CS1W-EIP21 V3.04 and earlier
OMRON Corporation	CS/CJ Series EtherNet/IP Unit	CJ1W-EIP21 V3.04 and earlier
omron	cj2m_cpu_unit	< 2.18
omron	cj2h_cpu_unit	< 3.04
omron	cs_cj_series_ethernet_ip_unit	< CS1W-EIP21 V3.04; < CJ1W-EIP21 V3.04

References

https://jvn.jp/en/vu/JVNVU92193064/Third Party Advisory
https://www.ia.omron.com/product/vulnerability/OMSR-2023-006_en.pdfVendor Advisory
https://jvn.jp/en/vu/JVNVU92193064/Third Party Advisory
https://www.ia.omron.com/product/vulnerability/OMSR-2023-006_en.pdfVendor Advisory

Timeline

Published: Aug 3, 2023
Last modified: Jun 17, 2026
NVD status: Modified

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