What’s Vulnerable › Vulnerabilities

CVE-2023-38744

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-08-03 · updated 2026-06-17
• Weakness: CWE-1284

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.

Affected products

• Omron Cj1W-Eip21 Firmware: through 3.04
• Omron Cj2H-Cpu64-Eip Firmware: through 3.04
• Omron Cj2H-Cpu65-Eip Firmware: through 3.04
• Omron Cj2H-Cpu66-Eip Firmware: through 3.04
• Omron Cj2H-Cpu67-Eip Firmware: through 3.04
• Omron Cj2H-Cpu68-Eip Firmware: through 3.04
• Omron Cj2M-Cpu31 Firmware: through 2.18
• Omron Cj2M-Cpu32 Firmware: through 2.18
• Omron Cj2M-Cpu33 Firmware: through 2.18
• Omron Cj2M-Cpu34 Firmware: through 2.18
• Omron Cj2M-Cpu35 Firmware: through 2.18
• Omron Cs1W-Eip21 Firmware: through 3.04

References

• https://jvn.jp/en/vu/JVNVU92193064/
• https://www.ia.omron.com/product/vulnerability/OMSR-2023-006_en.pdf
• https://jvn.jp/en/vu/JVNVU92193064/
• https://www.ia.omron.com/product/vulnerability/OMSR-2023-006_en.pdf

Get alerted when CVE-2023-38744 or the next vulnerability affects your stack