CVE-2021-20607: Mitsubishielectric Ezsocket

Medium severity, CVSS 5.5. EPSS: 1% chance of exploitation in the next 30 days.

Integer Underflow vulnerability in Mitsubishi Electric GX Works2 versions 1.606G and prior, Mitsubishi Electric MELSOFT Navigator versions 2.84N and prior and Mitsubishi Electric EZSocket versions 5.4 and prior allows an attacker to cause a DoS condition in the software by getting a user to open malicious project file specially crafted by an attacker.

Affected products

• Mitsubishielectric Ezsocket: up to and including 5.4
• Mitsubishielectric Gx WORKS2: up to and including 1.606g
• Mitsubishielectric Melsoft Navigator: any version

Published 2021-12-17. Last modified 2026-06-17.