Authentication bypass by capture-replay in Omron PLC CJ and CS Series
Priority LOW 37CWE-294Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · Low · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-294.
Summary
In Omron PLC CJ series, all versions, and Omron PLC CS series, all versions, an attacker could monitor traffic between the PLC and the controller and replay requests that could result in the opening and closing of industrial valves.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0087 59th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Omron PLC CJ and CS Series | Omron PLC CJ series, all versions, Omron PLC CS series, all versions | — | No fix listed | CNA |
- Omron PLC CJ and CS Series Vendor— Affected Omron PLC CJ series, all versions, Omron PLC CS series, all versions Fixed in — No fix listed CNA
CPE configurations NVD · 2
| 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_cj_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·OMRON Corporation
- cpe:2.3:o:omron:plc_cs_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-2019-13533
- 2026-10-03 Alias added: GHSA-rp7w-4xxf-cq5w
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-2019-13276 Missing brute-force protection in Omron PLC CJ, CS and NJ Series CVSS 3.1CRITICAL 9.8
Sources
- CVE-2019-13533 · CVE Program
- CVE-2019-13533 · NVD
- FIRST EPSS
- GHSA-rp7w-4xxf-cq5w · 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