CVE-2023-0811 - CVE House
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Status published Critical CVE-2023-0811

Omron CJ1M unit v4.0 and prior has improper access controls...

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Sam Hanson of Dragos reported these vulnerabilities to CISA.

References

Affected Vendor

Affected Software

CJ1M SYSMAC CJ-series, CJ1M SYSMAC CS-series , CJ1M SYSMAC CP-series
Vulnerable Versions:
All versions

Timeline

Official Publish: March 16th, 2023
Last Modified: January 16th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Weaknesses (CWE)

CWE-284

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1068 Exploitation for Privilege Escalation
Privilege Escalation
T1078 Valid Accounts
Persistence
T1213 Data from Information Repositories
Collection
T1565.002 Stored Data Manipulation
Impact