Improper authentication in MELSEC iQ-R series CPU modules R08/16/32/120SFCPU…
Priority LOW 27CWE-287Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-287.
Summary
Overly Restrictive Account Lockout Mechanism vulnerability in Mitsubishi Electric MELSEC iQ-R series CPU modules (R08/16/32/120SFCPU all versions, R08/16/32/120PSFCPU all versions) allows a remote unauthenticated attacker to lockout a legitimate user by continuously trying login with incorrect password.
Why it matters now
EPSS 0.01513 74th 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 |
|---|---|---|---|---|---|
| — | MELSEC iQ-R series CPU modules R08/16/32/120SFCPU; R08/16/32/120PSFCPU | all versions | — | No fix listed | CNA |
- MELSEC iQ-R series CPU modules R08/16/32/120SFCPU; R08/16/32/120PSFCPU Vendor— Affected all versions 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-2021-20598
- 2026-10-03 Alias added: GHSA-f5j9-pg8j-928p
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-2021-03827 Information disclosure in Mitsubishi Electric MELSEC iQ-R series Safety CPU modules… 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
Sources
- CVE-2021-20598 · CVE Program
- CVE-2021-20598 · NVD
- FIRST EPSS
- GHSA-f5j9-pg8j-928p · 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