CVE-2023-3373: Mitsubishielectric GS21 Firmware

Critical severity, CVSS 9.1. EPSS: 1% chance of exploitation in the next 30 days.

Predictable Exact Value from Previous Values vulnerability in Mitsubishi Electric Corporation GOT2000 Series GT21 model versions 01.49.000 and prior and GOT SIMPLE Series GS21 model versions 01.49.000 and prior allows a remote unauthenticated attacker to hijack data connections (session hijacking) or prevent legitimate users from establishing data connections (to cause DoS condition) by guessing the listening port of the data connection on FTP server and connecting to it.

Affected products

• Mitsubishielectric GS21 Firmware: before 01.50.000 (fixed in 01.50.000)
• Mitsubishielectric GT21 Firmware: before 01.50.000 (fixed in 01.50.000)

Published 2023-08-04. Last modified 2026-06-17.