CVE-2025-40817

Controller behavior modification via unauthenticated time change

Published Nov 11, 2025 · Updated Nov 11, 2025

Missing authentication in Siemens LOGO! and SIPLUS LOGO! 8 BM devices of all versions allows remote attackers to change device time. The UDP service on port 10006 accepts a time-changing interaction without conducting the required authentication validation. The attacker must have adjacent-network reachability; altered time can change controller behavior, while confidentiality and availability impacts are not reported.

CVSS severity7.1
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Siemens LOGO! and SIPLUS LOGO! 8 BM devices of all versions allows remote attackers to change device time. The UDP service on port 10006 accepts a time-changing interaction without conducting the required authentication validation. The attacker must have adjacent-network reachability; altered time can change controller behavior, while confidentiality and availability impacts are not reported.

The record

CVE
CVE-2025-40817
Published
Nov 11, 2025
Updated
Nov 11, 2025
Vendor
Siemens
Product
SIPLUS LOGO! 24RCEo
Classifications
CWE-306, T0836
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 11, 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=0 <*

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Siemens · SIPLUS LOGO! 24RCEoversion=0 <*
Siemens · LOGO! 24CEversion=0 <*
Siemens · SIPLUS LOGO! 24CEversion=0 <*
Siemens · LOGO! 24CEoversion=0 <*
Siemens · LOGO! 12/24RCEversion=0 <*
Siemens · LOGO! 12/24RCEoversion=0 <*
Siemens · LOGO! 24RCEversion=0 <*
Siemens · SIPLUS LOGO! 24CEoversion=0 <*
Siemens · LOGO! 24RCEoversion=0 <*
Siemens · LOGO! 230RCEversion=0 <*
Siemens · SIPLUS LOGO! 24RCEversion=0 <*
Siemens · SIPLUS LOGO! 230RCEoversion=0 <*
Siemens · SIPLUS LOGO! 12/24RCEversion=0 <*
Siemens · LOGO! 230RCEoversion=0 <*
Siemens · SIPLUS LOGO! 230RCEversion=0 <*
Siemens · SIPLUS LOGO! 12/24RCEoversion=0 <*

Published CVSS scores

6.5Siemens AGCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
7.1Siemens AGCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA: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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T0836Modify Parameter

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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