What’s Vulnerable › Vulnerabilities

CVE-2025-8531

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-19 · updated 2026-06-17
• Weakness: CWE-130

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

• Mitsubishi Electric Corporation MELSEC-Q Series Q03UDVCPU: from The first 5 digits of serial No. "24082" through "27081"
• Mitsubishi Electric Corporation MELSEC-Q Series Q04UDPVCPU: from The first 5 digits of serial No. "24082" through "27081"
• Mitsubishi Electric Corporation MELSEC-Q Series Q04UDVCPU: from The first 5 digits of serial No. "24082" through "27081"
• Mitsubishi Electric Corporation MELSEC-Q Series Q06UDPVCPU: from The first 5 digits of serial No. "24082" through "27081"
• Mitsubishi Electric Corporation MELSEC-Q Series Q06UDVCPU: from The first 5 digits of serial No. "24082" through "27081"
• Mitsubishi Electric Corporation MELSEC-Q Series Q13UDPVCPU: from The first 5 digits of serial No. "24082" through "27081"
• Mitsubishi Electric Corporation MELSEC-Q Series Q13UDVCPU: from The first 5 digits of serial No. "24082" through "27081"
• Mitsubishi Electric Corporation MELSEC-Q Series Q26UDPVCPU: from The first 5 digits of serial No. "24082" through "27081"
• Mitsubishi Electric Corporation MELSEC-Q Series Q26UDVCPU: from The first 5 digits of serial No. "24082" through "27081"

References

• https://jvn.jp/vu/JVNVU97846038/
• https://www.cisa.gov/news-events/ics-advisories/icsa-25-266-02
• https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-013_en.pdf

Get alerted when CVE-2025-8531 or the next vulnerability affects your stack