CVE-2023-33920

Physical root access via hard-coded password hash

Published Jun 13, 2023 · Updated Feb 13, 2025

Hard-coded credentials in Siemens SICAM A8000 CP-8031 and CP-8050 before CPCI85 V05 allow physically proximate attackers to obtain root access. The CPCI85 firmware stores the same root-password hash for every device in /etc/shadow, allowing a known corresponding password to authenticate at the serial console. Direct access to the PCB and its UART interface is required; successful login grants full root control over device confidentiality, configuration, and operation.

CVSS severity6.8
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hard-coded credentials in Siemens SICAM A8000 CP-8031 and CP-8050 before CPCI85 V05 allow physically proximate attackers to obtain root access. The CPCI85 firmware stores the same root-password hash for every device in /etc/shadow, allowing a known corresponding password to authenticate at the serial console. Direct access to the PCB and its UART interface is required; successful login grants full root control over device confidentiality, configuration, and operation.

The record

CVE
CVE-2023-33920
Published
Jun 13, 2023
Updated
Feb 13, 2025
Vendor
Siemens
Product
SICAM A8000 CP-8050 Master Module
Classifications
CWE-798, T0859
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.

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)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
T0859Valid Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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