CVE-2021-45033Network attack vector

Administrative shell access via hard-coded debug credentials

Published Jan 11, 2022 · Updated Aug 4, 2024

Hard-coded credentials in Siemens SICAM A8000 before 16.20 allow remote attackers to access an administrative shell through an enabled debug port. The undocumented debug service accepts embedded default credentials instead of device-specific credentials. A privileged user must first enable the port, and an attacker must know the credentials; successful access grants administrative shell control.

CVSS severity8.8
High
EPSS probability0.91%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hard-coded credentials in Siemens SICAM A8000 before 16.20 allow remote attackers to access an administrative shell through an enabled debug port. The undocumented debug service accepts embedded default credentials instead of device-specific credentials. A privileged user must first enable the port, and an attacker must know the credentials; successful access grants administrative shell control.

The record

CVE
CVE-2021-45033
Published
Jan 11, 2022
Updated
Aug 4, 2024
Vendor
Siemens
Product
CP-8022 Master Module with GPRS
Classifications
CWE-798, T1078.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=All versions < V16.20

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Siemens · CP-8022 Master Module with GPRSversion=All versions < V16.20
Siemens · CP-8021 Master Moduleversion=All versions < V16.20
Siemens · CP-8000 Master Module with I/O -25/+70°Cversion=All versions < V16.20
Siemens · CP-8000 Master Module with I/O -40/+70°Cversion=All versions < V16.20

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.5NIST NVDAV:N/AC:M/Au:S/C:C/I:C/A:C

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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
T1078.001Valid Accounts: Default 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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