CVE-2021-45034Network attack vector

Unauthenticated diagnostic-file disclosure via unprotected download links

Published Jan 11, 2022 · Updated Aug 4, 2024

Improper access control in Siemens CP-8000 and CP-802x modules before 16.20 allows remote attackers to read diagnostic files. The embedded web server serves privileged-user log files and diagnostic exports from their download URLs without requiring authentication. Exploitation requires network access and knowledge or discovery of a corresponding link; the documented impact is disclosure of file contents only.

CVSS severity7.5
High
EPSS probability2.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Siemens CP-8000 and CP-802x modules before 16.20 allows remote attackers to read diagnostic files. The embedded web server serves privileged-user log files and diagnostic exports from their download URLs without requiring authentication. Exploitation requires network access and knowledge or discovery of a corresponding link; the documented impact is disclosure of file contents only.

The record

CVE
CVE-2021-45034
Published
Jan 11, 2022
Updated
Aug 4, 2024
Vendor
Siemens
Product
CP-8022 Master Module with GPRS
Classifications
CWE-532, CWE-284, T0866
Attack vector
network
Privileges
unauthenticated

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 privilegesunauthenticated

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

7.5NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
4.3NISTAV:N/AC:M/Au:N/C:P/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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-532Insertion of Sensitive Information into Log File
CWE-284Improper Access Control
T0866Exploitation of Remote Services

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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