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CVE-2023-3373: Predictable Exact Value from Previous Values vulnerability in Mitsubishi Electric Corporation GOT2000 Series G

36
Routine
MEDIUM 5.9UPGRADEUPGRADE

CVE-2023-3373 is a medium-severity flaw (CVSS 5.9) affecting gt21 firmware, gs21 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 se

Why this priority

  • No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score5.9 (Medium)
Attack vectorNetwork (remote)
Attack complexityHigh
Privileges neededNone
User interactionRequired
EPSS exploit chance1.0% (top 37%)
CISA exploited listNo
WeaknessCWE-342, CWE-330
Published2023-08-04
Last modified2026-06-17
Publisher (CNA): Mitsubishi Electric Corporation · Vendor: mitsubishielectric

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Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

mitsubishielectric gt21 firmware UPGRADE
Affected: < 01.50.000
Fixed in: 01.50.000
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
mitsubishielectric gs21 firmware UPGRADE
Affected: < 01.50.000
Fixed in: 01.50.000
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-3373?

gt21 firmware: upgrade to 01.50.000; gs21 firmware: upgrade to 01.50.000. Exact commands for each OS are on this page.

Is CVE-2023-3373 being exploited?

CVE-2023-3373 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-3373 affect?

CVE-2023-3373 affects gt21 firmware, gs21 firmware. Severity is medium (CVSS 5.9). 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 unauthenticat

How urgent is CVE-2023-3373?

Priority 36/100. No elevated risk signals yet.

Software pages

Mitsubishi Electric vulnerabilities

Related CVEs

References

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