HOMEVULNERABILITIESCVE-2023-0811
CRITICAL

CVE-2023-0811

CWE-284Published: March 16, 2023· Updated: Jun 17, 2026

9.1
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2023-0811 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.1.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected Vendors & Products

omron256 product(s)
sysmac cj2h-cpu64 firmwaresysmac cj2h-cpu64sysmac cj2h-cpu64-eip firmwaresysmac cj2h-cpu64-eipsysmac cj2h-cpu65 firmwaresysmac cj2h-cpu65sysmac cj2h-cpu65-eip firmwaresysmac cj2h-cpu65-eipsysmac cj2h-cpu66 firmwaresysmac cj2h-cpu66sysmac cj2h-cpu66-eip firmwaresysmac cj2h-cpu66-eip+244
Source: NVD CPE · 256 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://www.cisa.gov/news-events/ics-advisories/icsa-23-073-01
ADVISORYhttps://www.ia.omron.com/product/vulnerability/OMSR-2023-001_en.pdf
ADVISORYhttps://www.cisa.gov/news-events/ics-advisories/icsa-23-073-01
ADVISORYhttps://www.ia.omron.com/product/vulnerability/OMSR-2023-001_en.pdf

All References (4)

→
https://www.cisa.gov/news-events/ics-advisories/icsa-23-073-01Third Party Advisory · US Government Resource
→
https://www.ia.omron.com/product/vulnerability/OMSR-2023-001_en.pdfMitigation · Vendor Advisory
→
https://www.cisa.gov/news-events/ics-advisories/icsa-23-073-01Third Party Advisory · US Government Resource
→
https://www.ia.omron.com/product/vulnerability/OMSR-2023-001_en.pdfMitigation · Vendor Advisory

Quick Facts

CVE IDCVE-2023-0811
CVSS Score9.1 / 10
SeverityCRITICAL
WeaknessCWE-284
CISA KEVNo
Affected1 vendor(s)
PublishedMar 16, 2023

Related CVEs (CWE-284)

CVE-2026-50746
10.0
CVE-2015-3060
10.0
CVE-2026-35308
10.0
CVE-2026-30966
10.0
CVE-2015-0929
10.0
CVE-2015-3061
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-0811 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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