Missing brute-force protection in Omron PLC CJ, CS and NJ Series
Priority MEDIUM 45CWE-307Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-307.
Summary
In Omron PLC CS series, all versions, Omron PLC CJ series, all versions, and Omron PLC NJ series, all versions, the software does not implement sufficient measures to prevent multiple failed authentication attempts within in a short time frame, making it more susceptible to brute force attacks.
Why it matters now
EPSS 0.01307 70th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Omron PLC CJ, CS and NJ Series | Omron PLC CS series, all versions, Omron PLC CJ series, all versions, Omron PLC NJ series, all versions | — | No fix listed | CNA |
- Omron PLC CJ, CS and NJ Series Vendor— Affected Omron PLC CS series, all versions, Omron PLC CJ series, all versions, Omron PLC NJ series, all versions Fixed in — No fix listed CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:omron:plc_cj_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | OMRON Corporation |
| cpe:2.3:o:omron:plc_cs_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | OMRON Corporation |
| cpe:2.3:o:omron:plc_nj_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | OMRON Corporation |
- cpe:2.3:o:omron:plc_cj_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·OMRON Corporation
- cpe:2.3:o:omron:plc_cs_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·OMRON Corporation
- cpe:2.3:o:omron:plc_nj_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·OMRON Corporation
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2019-18261
- 2026-10-03 Alias added: GHSA-pgg2-jx97-c5m4
References
More OMRON Corporation Plc Cj Firmware vulnerabilities
- TI-2019-13280 Omron’s CS and CJ series PLCs have an unrestricted externally accessible lock vulnerability. CVSS 3.1CRITICAL 9.8
- TI-2019-13275 Authentication bypass by spoofing in Omron PLC CJ and CS Series CVSS 3.1CRITICAL 9.8
- TI-2019-10165 Authentication bypass by capture-replay in Omron PLC CJ and CS Series CVSS 3.1HIGH 8.1
Sources
- CVE-2019-18261 · CVE Program
- CVE-2019-18261 · NVD
- FIRST EPSS
- GHSA-pgg2-jx97-c5m4 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences