CVE-2023-33921Public exploit

Root console access via exposed UART login

Published Jun 13, 2023 · Updated Feb 13, 2025

Exposed UART access in Siemens SICAM A8000 CP-8031 and CP-8050 before CPCI85 V05 allows physically proximate attackers to seek root login. Two PCB vias expose a 3.3 V, 115200-baud serial console that emits boot output and presents a root login prompt after a logic IC is removed. Direct circuit-board access and component removal are required; a guessed or cracked root password grants a privileged device console.

CVSS severity6.8
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Exposed UART access in Siemens SICAM A8000 CP-8031 and CP-8050 before CPCI85 V05 allows physically proximate attackers to seek root login. Two PCB vias expose a 3.3 V, 115200-baud serial console that emits boot output and presents a root login prompt after a logic IC is removed. Direct circuit-board access and component removal are required; a guessed or cracked root password grants a privileged device console.

The record

CVE
CVE-2023-33921
Published
Jun 13, 2023
Updated
Feb 13, 2025
Vendor
Siemens
Product
SICAM A8000 CP-8050 Master Module
Classifications
CWE-749, T1110.001
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record 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=All versions < CPCI85 V05

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Siemens · SICAM A8000 CP-8050 Master Moduleversion=All versions < CPCI85 V05
Siemens · SICAM A8000 CP-8031 Master Moduleversion=All versions < CPCI85 V05

Published CVSS scores

6.8Siemens AGCVSS:3.1/AV:P/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.

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No observations available

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

Weakness, pattern, technique

CWE-749Exposed Dangerous Method or Function
T1110.001Brute Force: Password Guessing

Public exploit references

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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