Improper Handling of Length Parameter Inconsistency vulnerability in Mitsubishi Electric…
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
Improper Handling of Length Parameter Inconsistency vulnerability in Mitsubishi Electric Corporation MELSEC-Q Series Q03UDVCPU, Q04UDVCPU, Q06UDVCPU, Q13UDVCPU, Q26UDVCPU, Q04UDPVCPU, Q06UDPVCPU, Q13UDPVCPU, and Q26UDPVCPU with the first 5 digits of serial No. "24082" to "27081" allows a remote attacker to cause an integer underflow by sending specially crafted packets to the affected product to stop Ethernet communication and the execution of control programs on the product, when the user authentication function is enabled. The user authentication function is enabled by default only when settings are configured by GX Works2, which complies with the Cybersecurity Law of the People's Republic of China, and is normally disabled.
Why it matters now
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 |
|---|---|---|---|---|---|
| Mitsubishi Electric Corporation | MELSEC-Q Series Q03UDVCPU | The first 5 digits of serial No. "24082" to "27081" | — | No fix listed | CNA |
| Mitsubishi Electric Corporation | MELSEC-Q Series Q04UDVCPU | The first 5 digits of serial No. "24082" to "27081" | — | No fix listed | CNA |
| Mitsubishi Electric Corporation | MELSEC-Q Series Q06UDVCPU | The first 5 digits of serial No. "24082" to "27081" | — | No fix listed | CNA |
| Mitsubishi Electric Corporation | MELSEC-Q Series Q13UDVCPU | The first 5 digits of serial No. "24082" to "27081" | — | No fix listed | CNA |
| Mitsubishi Electric Corporation | MELSEC-Q Series Q26UDVCPU | The first 5 digits of serial No. "24082" to "27081" | — | No fix listed | CNA |
| Mitsubishi Electric Corporation | MELSEC-Q Series Q04UDPVCPU | The first 5 digits of serial No. "24082" to "27081" | — | No fix listed | CNA |
| Mitsubishi Electric Corporation | MELSEC-Q Series Q06UDPVCPU | The first 5 digits of serial No. "24082" to "27081" | — | No fix listed | CNA |
| Mitsubishi Electric Corporation | MELSEC-Q Series Q13UDPVCPU | The first 5 digits of serial No. "24082" to "27081" | — | No fix listed | CNA |
| Mitsubishi Electric Corporation | MELSEC-Q Series Q26UDPVCPU | The first 5 digits of serial No. "24082" to "27081" | — | No fix listed | CNA |
- MELSEC-Q Series Q03UDVCPU VendorMitsubishi Electric Corporation Affected The first 5 digits of serial No. "24082" to "27081" Fixed in — No fix listed CNA
- MELSEC-Q Series Q04UDVCPU VendorMitsubishi Electric Corporation Affected The first 5 digits of serial No. "24082" to "27081" Fixed in — No fix listed CNA
- MELSEC-Q Series Q06UDVCPU VendorMitsubishi Electric Corporation Affected The first 5 digits of serial No. "24082" to "27081" Fixed in — No fix listed CNA
- MELSEC-Q Series Q13UDVCPU VendorMitsubishi Electric Corporation Affected The first 5 digits of serial No. "24082" to "27081" Fixed in — No fix listed CNA
- MELSEC-Q Series Q26UDVCPU VendorMitsubishi Electric Corporation Affected The first 5 digits of serial No. "24082" to "27081" Fixed in — No fix listed CNA
- MELSEC-Q Series Q04UDPVCPU VendorMitsubishi Electric Corporation Affected The first 5 digits of serial No. "24082" to "27081" Fixed in — No fix listed CNA
- MELSEC-Q Series Q06UDPVCPU VendorMitsubishi Electric Corporation Affected The first 5 digits of serial No. "24082" to "27081" Fixed in — No fix listed CNA
- MELSEC-Q Series Q13UDPVCPU VendorMitsubishi Electric Corporation Affected The first 5 digits of serial No. "24082" to "27081" Fixed in — No fix listed CNA
- MELSEC-Q Series Q26UDPVCPU VendorMitsubishi Electric Corporation Affected The first 5 digits of serial No. "24082" to "27081" Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-8531
- 2026-10-03 Alias added: GHSA-r7hp-8xqq-gfpr
References
More Mitsubishi Electric Corporation vulnerabilities
- TI-2022-14737 Deserialization of untrusted data in Mitsubishi Electric Corporation GENESIS64 CVSS 3.1CRITICAL 9.8
- TI-2022-19113 Authentication Bypass Vulnerability in Web Server Function on MELSEC Series CVSS 3.1CRITICAL 9.1
- TI-2023-01345 Denial-of-Service and Remote Code Execution Vulnerability in MELSEC Series CPU module CVSS 3.1CRITICAL 10.0
- TI-2023-06346 Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')… CVSS 3.1CRITICAL 9.8
- TI-2023-03131 Denial of Service (DoS) and Remote Code Execution Vulnerability in MITSUBISHI CNC Series CVSS 3.1CRITICAL 9.8
- TI-2021-03821 Memory corruption in Mitsubishi Electric Corporation CPU Module Logging Configuration Tool CVSS 3.1CRITICAL 9.8
Sources
- CVE-2025-8531 · CVE Program
- CVE-2025-8531 · NVD
- FIRST EPSS
- GHSA-r7hp-8xqq-gfpr · 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