CVE-2025-27396
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA vulnerability has been identified in SCALANCE LPE9403 (6GK5998-3GS00-2AC2) (All versions < V4.0). Affected devices do not properly limit the elevation of privileges required to perform certain valid functionality. This could allow an authenticated lowly-privileged remote attacker to escalate their privileges.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThis is a privilege escalation vulnerability in SCALANCE LPE9403 industrial network devices. An authenticated attacker with low-level access can elevate their privileges to perform administrative functions that should be restricted. The vulnerability stems from improper authorization controls on certain valid device functionality.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 4.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm device model is SCALANCE LPE9403Access the device web interface or CLI and verify the exact model number in system information or device status. Alternatively, check the physical device label or SNMP sysDescr.Affected if Device is not a SCALANCE LPE9403 model
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Check installed firmware versionIn the device web interface, navigate to System > Firmware or use CLI command 'show version' or 'show system-info' to retrieve the firmware version number.Affected if Firmware version is below 4.0 (for example, 3.x.x or earlier)
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Verify low-level authenticated access existsCheck for any user accounts with limited privileges (such as guest, user, or operator-level accounts) in the device user management or AAA configuration.Affected if Low-privilege authenticated accounts exist on the device
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Review privilege escalation indicatorsExamine device logs, audit logs, or accounting records for any commands or actions performed by users that exceed their assigned privilege level. Check for unexpected administrative operations from standard user accounts.Affected if Administrative actions were performed by accounts that should not have elevated privileges
The environment is affected if the device is a SCALANCE LPE9403 running firmware version prior to 4.0 and low-level authenticated access is available, allowing privilege escalation to administrative functions.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped4.0
Upgrade SCALANCE LPE9403 firmware to version V4.0 or later. Prior to upgrade, back up current configuration and plan for maintenance window as industrial设备.
V4.0
- 1. Obtain the SCALANCE LPE9403 firmware version V4.0 or later from the official Siemens cert-portal or Siemens Industry Online Support
- 2. Review the firmware release notes and installation instructions provided by Siemens
- 3. Backup the current device configuration before performing the upgrade
- 4. Upload the V4.0 firmware to the SCALANCE LPE9403 device using the device's web interface or management tool
- 5. Verify the firmware installation was successful by checking the device firmware version
- 6. Confirm the device is functioning correctly and all expected services are operational
- 7. Verify that the previously low-privileged accounts can no longer perform elevated operations
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation4.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,968.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-27396 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-27396 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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