CVE-2023-0811

CRITICAL

Omron SYSMAC CJ2H and CJ2M Firmware - Unauthenticated Improper Access Control via PROGRAM AREA WRITE Command

Title source: llm
STIX 2.1

Description

Omron CJ1M unit v4.0 and prior has improper access controls on the memory region where the UM password is stored. If an adversary issues a PROGRAM AREA WRITE command to a specific memory region, they could overwrite the password. This may lead to disabling UM protections or setting a non-ASCII password (non-keyboard characters) and preventing an engineer from viewing or modifying the user program.

References (2)

Core 2
Core References
Third Party Advisory, US Government Resource
https://www.cisa.gov/news-events/ics-advisories/icsa-23-073-01

Scores

CVSS v3 9.1
EPSS 0.0062
EPSS Percentile 45.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-284
Status published
Products (50)
omron/sysmac_cj2h-cpu64-eip_firmware
omron/sysmac_cj2h-cpu64_firmware
omron/sysmac_cj2h-cpu65-eip_firmware
omron/sysmac_cj2h-cpu65_firmware
omron/sysmac_cj2h-cpu66-eip_firmware
omron/sysmac_cj2h-cpu66_firmware
omron/sysmac_cj2h-cpu67-eip_firmware
omron/sysmac_cj2h-cpu67_firmware
omron/sysmac_cj2h-cpu68-eip_firmware
omron/sysmac_cj2h-cpu68_firmware
... and 40 more
Published Mar 16, 2023
Tracked Since Feb 18, 2026