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CVE-2023-3373

• Severity: critical (CVSS 9.1 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: 2023-08-04 · updated 2026-06-17
• Weakness: CWE-342

Description

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

How to fix

Upgrade to a fixed version: Mitsubishielectric Gs21 Firmware 01.50.000; Mitsubishielectric Gt21 Firmware 01.50.000. Check the vendor advisory for mitigations.

References

• https://jvn.jp/vu/JVNVU92167394/index.html
• https://www.cisa.gov/news-events/ics-advisories/icsa-23-215-01
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2023-006_en.pdf
• https://jvn.jp/vu/JVNVU92167394/index.html
• https://www.cisa.gov/news-events/ics-advisories/icsa-23-215-01
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2023-006_en.pdf

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