CVE-2021-46304Network attack vector

Debug-information disclosure via unauthenticated diagnostic web pages

Published Aug 10, 2022 · Updated Oct 20, 2025

Information disclosure in all Siemens SICAM A8000 CP-8000, CP-8021, and CP-8022 versions allows remote attackers to read diagnostic data. The manually enabled protocol-firmware web server exposes its pages without authentication, revealing debug details such as internal network topology and connected systems. Exposure exists only when an operator activates the diagnostic and commissioning module; the firmware is secure by default, and the documented impact is read-only disclosure.

CVSS severity7.5
High
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in all Siemens SICAM A8000 CP-8000, CP-8021, and CP-8022 versions allows remote attackers to read diagnostic data. The manually enabled protocol-firmware web server exposes its pages without authentication, revealing debug details such as internal network topology and connected systems. Exposure exists only when an operator activates the diagnostic and commissioning module; the firmware is secure by default, and the documented impact is read-only disclosure.

The record

CVE
CVE-2021-46304
Published
Aug 10, 2022
Updated
Oct 20, 2025
Vendor
Siemens
Product
CP-8022 Master Module with GPRS
Classifications
CWE-284, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 10, 2022CVE publishedPublication date reported by the CVE source.
  2. Oct 20, 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

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

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

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1190Exploit Public-Facing Application

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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