High

Unauthenticated device time change in Siemens LOGO! 8 BM devices

IdentifiersCVE-2025-40817CWE-306· Missing Authentication for…

CVE-2025-40817 is a missing authentication for critical function vulnerability affecting Siemens LOGO! 8 BM devices, including the listed LOGO! and SIPLUS LOGO! models, all versions. According to the provided advisory content, affected devices do not conduct certain validations when interacting with them, allowing an unauthenticated remote attacker to change the device time. Because time settings can influence device logic, scheduling, and time-dependent operations, unauthorized modification of the clock can cause the device to behave differently from intended operation.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows an unauthenticated remote attacker to alter the device's time configuration remotely. This can change device behavior, potentially affecting time-based control logic, schedules, event handling, logging accuracy, and operational reliability. The issue does not, based on the provided information, directly provide code execution, but it can undermine integrity and availability of industrial control processes by causing unintended or unsafe behavior.

Mitigation

If you can’t patch tonight, do this now.

Siemens recommended restricting network access to UDP port 10006 to trusted IP addresses only. Additional defensive measures supported by the context include limiting exposure of affected devices to untrusted networks and enforcing network segmentation so that only authorized management systems can reach the vulnerable service.

Remediation

Patch, then assume compromise.

According to the provided advisory content, Siemens has stated that no fix is planned for CVE-2025-40817. As a result, there is no vendor patch or firmware update available to remediate the vulnerability in affected versions.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

ACTIVITY FEED

Recent activity

4 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.

4 SOURCESView more in app

No news coverage yet. Advisories and community discussion only.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity3

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2025-40817

NVD

nvd.nist.gov/vuln/detail/CVE-2025-40817

MITRE CWE · CWE-306

Missing Authentication for Critical Function

cert-portal.siemens.com

cert-portal.siemens.com/productcert/html/ssa-267056.html