Uncontrolled resource consumption in Omron PLC CJ Series
Priority MEDIUM 42CWE-400Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-400.
Summary
In all versions of Omron PLC CJ Series, an attacker can send a series of specific data packets within a short period, causing a service error on the PLC Ethernet module, which in turn causes a PLC service denied result.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01592 75th 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
- Yes
- 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 Series | all versions | — | No fix listed | CNA |
- Omron PLC CJ Series Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:omron:plc_cj1_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | OMRON Corporation |
| cpe:2.3:h:omron:plc_cj1:-:*:*:*:*:*:*:* | not specified by NVD | Running on | OMRON Corporation |
| cpe:2.3:o:omron:plc_cj2_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | OMRON Corporation |
| cpe:2.3:h:omron:plc_cj2:-:*:*:*:*:*:*:* | not specified by NVD | Running on | OMRON Corporation |
- cpe:2.3:o:omron:plc_cj1_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·OMRON Corporation
- cpe:2.3:h:omron:plc_cj1:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·OMRON Corporation
- cpe:2.3:o:omron:plc_cj2_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·OMRON Corporation
- cpe:2.3:h:omron:plc_cj2:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·OMRON Corporation
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2020-6986
- 2026-10-03 Alias added: GHSA-jpcw-9g3f-frpr
References
Sources
- CVE-2020-6986 · CVE Program
- CVE-2020-6986 · NVD
- FIRST EPSS
- GHSA-jpcw-9g3f-frpr · 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