CVE-2023-3373

Name: CVE-2023-3373
Creator: NVD / NIST
Published: 2023-08-04T00:15:14.13+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 0.75%

Last modified Jun 17, 2026

CVE-2023-3373 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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.. EPSS estimates a 0.75% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

EPSS Probability

0.75%

50.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mitsubishielectric	Gt21 Firmware	< 01.50.000
Mitsubishielectric	Gs21 Firmware	< 01.50.000

References

https://jvn.jp/vu/JVNVU92167394/index.htmlThird Party Advisory
https://www.cisa.gov/news-events/ics-advisories/icsa-23-215-01Third Party Advisory, US Government Resource
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2023-006_en.pdfVendor Advisory
https://jvn.jp/vu/JVNVU92167394/index.htmlThird Party Advisory
https://www.cisa.gov/news-events/ics-advisories/icsa-23-215-01Third Party Advisory, US Government Resource
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2023-006_en.pdfVendor Advisory

Timeline

Published: Aug 4, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-3373?

How severe is CVE-2023-3373?

CVE-2023-3373 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.75% probability of exploitation in the next 30 days.

How do I fix CVE-2023-3373?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-3373?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST