Uncontrolled resource consumption in Mitsubishi Electric MELSEC iQ-R series C Controller…
Priority LOW 31CWE-400Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-400.
Summary
Uncontrolled resource consumption in Mitsubishi Electric MELSEC iQ-R series C Controller Module R12CCPU-V Firmware Versions "16" and prior allows a remote unauthenticated attacker to cause a denial-of-service (DoS) condition by sending a large number of packets in a short time while the module starting up. System reset is required for recovery.
Why it matters now
EPSS 0.02385 84th 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 |
|---|---|---|---|---|---|
| — | Mitsubishi Electric MELSEC iQ-R series C Controller Module R12CCPU-V | Mitsubishi Electric MELSEC iQ-R series C Controller Module R12CCPU-V Firmware Versions "16" and prior | — | No fix listed | CNA |
- Mitsubishi Electric MELSEC iQ-R series C Controller Module R12CCPU-V Vendor— Affected Mitsubishi Electric MELSEC iQ-R series C Controller Module R12CCPU-V Firmware Versions "16" and prior Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:mitsubishielectric:r12ccpu-v_firmware:*:*:*:*:*:*:*:* | up to 16 | Vulnerable | Mitsubishi Electric Europe B.V. |
| cpe:2.3:h:mitsubishielectric:r12ccpu-v:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Mitsubishi Electric Europe B.V. |
- cpe:2.3:o:mitsubishielectric:r12ccpu-v_firmware:*:*:*:*:*:*:*:* Versions up to 16 Vulnerable ·Mitsubishi Electric Europe B.V.
- cpe:2.3:h:mitsubishielectric:r12ccpu-v:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Mitsubishi Electric Europe B.V.
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-20600
- 2026-10-03 Alias added: GHSA-8r87-v86x-7qm3
References
More Mitsubishi Electric Europe B.V. R12ccpu-v Firmware vulnerabilities
- TI-2020-12755 Mitsubishi Electric Multiple Products CVSS 3.1CRITICAL 9.8
- TI-2020-04501 Mitsubishi Electric MELSEC C Controller Module and MELIPC Series MI5000 MELSEC-Q Series C… CVSS 3.1CRITICAL 9.8
Sources
- CVE-2021-20600 · CVE Program
- CVE-2021-20600 · NVD
- FIRST EPSS
- GHSA-8r87-v86x-7qm3 · GitHub Advisory Database · CC BY 4.0
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