Auth bypass in Omron Cj2h-Cpu64
CVE-2023-27396
FINS (Factory Interface Network Service) is a message communication protocol, which is designed to be used in closed FA (Factory Automation) networks, and is used in FA networks composed of OMRON products. Multiple OMRON products that implement FINS protocol contain following security issues -- (1)Plaintext communication, and (2)No authentication required. When FINS messages are intercepted, the contents may be retrieved. When arbitrary FINS messages are injected, any commands may be executed on, or the system information may be retrieved from, the affected device. Affected products and versions are as follows: SYSMAC CS-series CPU Units, all versions, SYSMAC CJ-series CPU Units, all versions, SYSMAC CP-series CPU Units, all versions, SYSMAC NJ-series CPU Units, all versions, SYSMAC NX1P-series CPU Units, all versions, SYSMAC NX102-series CPU Units, all versions, and SYSMAC NX7 Database Connection CPU Units (Ver.1.16 or later)
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.014 (70.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 70.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000
Affected products
Weakness classification (CWE)
References
- www.us-cert.gov/ics/advisories/icsa-19-346-02 (US Government Resource, Third Party Advisory, Not Applicable)
- www.ia.omron.com/product/vulnerability/OMSR-2023-003_en.pdf (Vendor Advisory)
- www.fa.omron.co.jp/product/vulnerability/OMSR-2023-003_ja.pdf (Vendor Advisory)
- jvn.jp/en/ta/JVNTA91513661/ (Third Party Advisory)
- jvn.jp/ta/JVNTA91513661/ (Third Party Advisory)
- www.us-cert.gov/ics/advisories/icsa-20-063-03 (US Government Resource, Third Party Advisory, Not Applicable)
- www.cisa.gov/uscert/ics/advisories/icsa-22-179-02 (US Government Resource, Third Party Advisory, Not Applicable)
Frequently asked questions
- What is CVE-2023-27396?
- CVE-2023-27396 is a critical-severity vulnerability in Omron Cj2h-Cpu64, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2023-06-19.
- How severe is CVE-2023-27396?
- Critical severity. CVSS v3 base score is 9.8 out of 10.