Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mitsubishi Electric | MELSEC-Q Series Q03UDVCPU | The first 5 digits of serial No. "24082" to "27081" | — |
| Mitsubishi Electric | MELSEC-Q Series Q04UDVCPU | The first 5 digits of serial No. "24082" to "27081" | — |
| Mitsubishi Electric | MELSEC-Q Series Q06UDVCPU | The first 5 digits of serial No. "24082" to "27081" | — |
| Mitsubishi Electric | MELSEC-Q Series Q13UDVCPU | The first 5 digits of serial No. "24082" to "27081" | — |
| Mitsubishi Electric | MELSEC-Q Series Q26UDVCPU | The first 5 digits of serial No. "24082" to "27081" | — |
| Mitsubishi Electric | MELSEC-Q Series Q04UDPVCPU | The first 5 digits of serial No. "24082" to "27081" | — |
| Mitsubishi Electric | MELSEC-Q Series Q06UDPVCPU | The first 5 digits of serial No. "24082" to "27081" | — |
| Mitsubishi Electric | MELSEC-Q Series Q13UDPVCPU | The first 5 digits of serial No. "24082" to "27081" | — |
| Mitsubishi Electric | MELSEC-Q Series Q26UDPVCPU | The first 5 digits of serial No. "24082" to "27081" | — |
Advisories 1
- ICSA-25-266-02 Mitsubishi Electric MELSEC-Q Series CPU Module CISA ICS & IT advisories · Sep 23, 2025
References
- https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-013_en.pdf vendor-advisory
- https://jvn.jp/vu/JVNVU97846038/ government-resource
- https://www.cisa.gov/news-events/ics-advisories/icsa-25-266-02 government-resource