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Vulnerability · Published Sep 19, 2025 · Assigned by Mitsubishi

CVE-2025-8531

Medium 6.8

In plain English

A medium-severity security flaw in MELSEC-Q Series Q03UDVCPU from Mitsubishi Electric Corporation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 65% of all known vulnerabilities).

Severity (CVSS 3.1)6.8Medium
Exploit odds (30 days)1.1%top 34.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 (as reported)

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

Weakness: CWE-130 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H

References