SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

CVE-2023-38744

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.

HIGH 7.5EPSS 0.87%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.87%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 3.1
7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
0.87% probability · 57th percentile
CISA KEV
Not listed
Weakness
CWE-1284
Affected
omron/cj2m-cpu35 firmware · omron/cj2m-cpu34 firmware · omron/cj2m-cpu33 firmware · omron/cj2m-cpu32 firmware · omron/cj2m-cpu31 firmware · omron/cj2h-cpu68-eip firmware · omron/cj2h-cpu67-eip firmware · omron/cj2h-cpu66-eip firmware · omron/cj2h-cpu65-eip firmware · omron/cj2h-cpu64-eip firmware · omron/cs1w-eip21 firmware · omron/cj1w-eip21 firmware
Source
vultures@jpcert.or.jp

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.