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.

Related CVEs

CVE-2023-0811

Key Information

GHSA ID

GHSA-xmm9-hrfr-pphf

Published

March 16, 2023 6:30 PM

Last Modified

March 28, 2023 6:30 PM

CVSS Score

9.0 /10

Primary Ecosystem

Unknown

Primary Package

Unknown

GitHub Reviewed

✗ No

Dataset

Last updated: September 11, 2025 6:35 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.