CVE-2023-45851

Unauthenticated MQTT message injection

Published Oct 25, 2023 · Updated Sep 11, 2024

Missing authentication in the Android Client for Bosch Rexroth ctrlX HMI Web Panel WR21 allows adjacent attackers to send fake MQTT messages to the HMI. The client connects to an MQTT broker without verifying the broker identity, allowing a malicious same-subnet broker to impersonate the legitimate service and deliver attacker-controlled messages. The attack requires adjacent-network access and an enrolled client; crafted messages can alter HMI command handling, with confidentiality, integrity, and availability impact described by the CVSS assessment.

CVSS severity8.8
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in the Android Client for Bosch Rexroth ctrlX HMI Web Panel WR21 allows adjacent attackers to send fake MQTT messages to the HMI. The client connects to an MQTT broker without verifying the broker identity, allowing a malicious same-subnet broker to impersonate the legitimate service and deliver attacker-controlled messages. The attack requires adjacent-network access and an enrolled client; crafted messages can alter HMI command handling, with confidentiality, integrity, and availability impact described by the CVSS assessment.

The record

CVE
CVE-2023-45851
Published
Oct 25, 2023
Updated
Sep 11, 2024
Vendor
Bosch Rexroth AG
Product
ctrlX HMI Web Panel WR2107
Classifications
CWE-306, T1557
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <RC7(Build date 20231107)
  2. Affected versionversion=all

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Bosch Rexroth AG · ctrlX HMI Web Panel WR2107version=0 <RC7(Build date 20231107); version=all
Bosch Rexroth AG · ctrlX HMI Web Panel WR2115version=all
Bosch Rexroth AG · ctrlX HMI Web Panel WR2110version=all

Published CVSS scores

8.8Bosch Rexroth AGCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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