Information disclosure in Mitsubishi Electric MELSEC iQ-R series Safety CPU modules…
Priority LOW 37CWE-200Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-200.
Summary
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08/16/32/120SFCPU firmware versions "26" and prior and Mitsubishi Electric MELSEC iQ-R series SIL2 Process CPU modules R08/16/32/120PSFCPU firmware versions "11" and prior allows a remote unauthenticated attacker to acquire legitimate user names registered in the module via brute-force attack on user names.
Why it matters now
EPSS 0.0237 83rd 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 Safety CPU modules R08/16/32/120SFCPU; Mitsubishi Electric MELSEC iQ-R series SIL2 Process CPU modules R08/16/32/120PSFCPU | Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08/16/32/120SFCPU firmware versions "26" and prior; Mitsubishi Electric MELSEC iQ-R series SIL2 Process CPU modules R08/16/32/120PSFCPU firmware versions "11" and prior | — | No fix listed | CNA |
- Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08/16/32/120SFCPU; Mitsubishi Electric MELSEC iQ-R series SIL2 Process CPU modules R08/16/32/120PSFCPU Vendor— Affected Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08/16/32/120SFCPU firmware versions "26" and prior; Mitsubishi Electric MELSEC iQ-R series SIL2 Process CPU modules R08/16/32/120PSFCPU firmware versions "11" and prior Fixed in — No fix listed CNA
CPE configurations NVD · 16
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:mitsubishielectric:r08sfcpu_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Mitsubishi Electric Europe B.V. |
| cpe:2.3:h:mitsubishielectric:r08sfcpu:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Mitsubishi Electric Europe B.V. |
| cpe:2.3:o:mitsubishielectric:r16sfcpu_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Mitsubishi Electric Europe B.V. |
| cpe:2.3:h:mitsubishielectric:r16sfcpu:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Mitsubishi Electric Europe B.V. |
| cpe:2.3:o:mitsubishielectric:r32sfcpu_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Mitsubishi Electric Europe B.V. |
| cpe:2.3:h:mitsubishielectric:r32sfcpu:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Mitsubishi Electric Europe B.V. |
| cpe:2.3:o:mitsubishielectric:r120sfcpu_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Mitsubishi Electric Europe B.V. |
| cpe:2.3:h:mitsubishielectric:r120sfcpu:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Mitsubishi Electric Europe B.V. |
| cpe:2.3:o:mitsubishielectric:r08psfcpu_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Mitsubishi Electric Europe B.V. |
| cpe:2.3:h:mitsubishielectric:r08psfcpu:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Mitsubishi Electric Europe B.V. |
- cpe:2.3:o:mitsubishielectric:r08sfcpu_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Mitsubishi Electric Europe B.V.
- cpe:2.3:h:mitsubishielectric:r08sfcpu:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Mitsubishi Electric Europe B.V.
- cpe:2.3:o:mitsubishielectric:r16sfcpu_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Mitsubishi Electric Europe B.V.
- cpe:2.3:h:mitsubishielectric:r16sfcpu:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Mitsubishi Electric Europe B.V.
- cpe:2.3:o:mitsubishielectric:r32sfcpu_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Mitsubishi Electric Europe B.V.
- cpe:2.3:h:mitsubishielectric:r32sfcpu:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Mitsubishi Electric Europe B.V.
- cpe:2.3:o:mitsubishielectric:r120sfcpu_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Mitsubishi Electric Europe B.V.
- cpe:2.3:h:mitsubishielectric:r120sfcpu:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Mitsubishi Electric Europe B.V.
- cpe:2.3:o:mitsubishielectric:r08psfcpu_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Mitsubishi Electric Europe B.V.
- cpe:2.3:h:mitsubishielectric:r08psfcpu:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Mitsubishi Electric Europe B.V.
Show 6 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:mitsubishielectric:r16psfcpu_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Mitsubishi Electric Europe B.V. |
| cpe:2.3:h:mitsubishielectric:r16psfcpu:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Mitsubishi Electric Europe B.V. |
| cpe:2.3:o:mitsubishielectric:r32psfcpu_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Mitsubishi Electric Europe B.V. |
| cpe:2.3:h:mitsubishielectric:r32psfcpu:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Mitsubishi Electric Europe B.V. |
| cpe:2.3:o:mitsubishielectric:r120psfcpu_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Mitsubishi Electric Europe B.V. |
| cpe:2.3:h:mitsubishielectric:r120psfcpu:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Mitsubishi Electric Europe B.V. |
- cpe:2.3:o:mitsubishielectric:r16psfcpu_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Mitsubishi Electric Europe B.V.
- cpe:2.3:h:mitsubishielectric:r16psfcpu:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Mitsubishi Electric Europe B.V.
- cpe:2.3:o:mitsubishielectric:r32psfcpu_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Mitsubishi Electric Europe B.V.
- cpe:2.3:h:mitsubishielectric:r32psfcpu:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Mitsubishi Electric Europe B.V.
- cpe:2.3:o:mitsubishielectric:r120psfcpu_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Mitsubishi Electric Europe B.V.
- cpe:2.3:h:mitsubishielectric:r120psfcpu:-:*:*:*:*:*:*:* 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-2021-20594
- 2026-10-03 Alias added: GHSA-3852-pg93-43w3
References
More Mitsubishi Electric Europe B.V. R08psfcpu Firmware vulnerabilities
- TI-2021-03832 Cleartext transmission of sensitive information in Mitsubishi Electric Corporation MELSEC… CVSS 3.1CRITICAL 9.1
- TI-2021-03830 Insufficiently protected credentials in Mitsubishi Electric MELSEC iQ-R series Safety CPU… CVSS 3.1CRITICAL 9.1
- TI-2020-04633 Uncontrolled resource consumption in Mitsubishi Electric Corporation MELSEC iQ-R CVSS 3.1HIGH 7.5
- TI-2021-03824 Uncontrolled resource consumption in MELSEC iQ-R series CPU modules CVSS 3.1HIGH 7.5
- TI-2023-06227 Incorrect Privilege Assignment vulnerability in Mitsubishi Electric Corporation MELSEC… CVSS 3.1MEDIUM 6.5
- TI-2021-03831 Improper authentication in MELSEC iQ-R series CPU modules R08/16/32/120SFCPU… CVSS 3.1MEDIUM 5.3
Sources
- CVE-2021-20594 · CVE Program
- CVE-2021-20594 · NVD
- FIRST EPSS
- GHSA-3852-pg93-43w3 · GitHub Advisory Database · CC BY 4.0
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