CVE-2025-40737
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 SINEC NMS (All versions < V4.0). The affected application does not properly validate file paths when extracting uploaded ZIP files. This could allow an attacker to write arbitrary files to restricted locations and potentially execute code with elevated privileges (ZDI-CAN-26571).
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 · high confidenceSINEC NMS versions prior to V4.0 contain a path traversal vulnerability in its ZIP file extraction logic. The application does not validate file paths within uploaded ZIP archives, allowing an attacker to craft malicious archives with paths like '../../../../etc/cron.d' to write arbitrary files to restricted filesystem locations and potentially achieve code execution with elevated privileges.
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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Identify SINEC NMS installationSearch for SINEC NMS installation directories or check for SINEC NMS services running on the system. Common locations may include C:\Program Files\Siemens\SINEC or /opt/siemens/sinec directory trees.Affected if SINEC NMS is found running on the system
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Determine installed versionLocate the SINEC NMS version information, typically found in the application itself, in an 'about' or 'info' section, or in version files within the installation directory. Compare the found version against V4.0.Affected if The installed version is prior to V4.0 (e.g., V3.x, V2.x, etc.)
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Check for ZIP import/upload functionalityIdentify whether SINEC NMS has functionality for importing or uploading ZIP archives, such as for backup restore, import features, or plugin/theme uploads. Review application logs or configuration for evidence of ZIP file processing.Affected if ZIP file import/upload functionality is present and enabled in the application
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Inspect for suspicious files in restricted directoriesExamine directories outside the expected application data paths for recently created or modified files. Check locations such as /etc/cron.d, /etc/cron.daily, Windows system directories, or application root parent directories for unexpected files with recent timestamps.Affected if Unexpected files are found in restricted system directories, especially those containing '../../' path patterns in their creation context or containing executable content
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Review application logs for path traversal indicatorsSearch SINEC NMS logs for entries containing '../' sequences, warnings about file extraction outside intended directories, or errors indicating failed path validation during archive processing.Affected if Logs contain path traversal attempts or extraction errors referencing paths outside the intended directory
A system is affected if SINEC NMS version is prior to V4.0 and the ZIP file import/upload feature is in use, with potential compromise indicated by suspicious files in restricted directories.
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 to SINEC NMS V4.0 or later. If immediate patching is not possible, implement strict validation of file paths within ZIP archives before extraction, rejecting any paths containing '..' or absolute path references.
SINEC NMS V4.0 or later
- 1. Back up the current SINEC NMS configuration and database according to organizational backup procedures
- 2. Download SINEC NMS V4.0 or later from the official Siemens support portal (cert-portal.siemens.com or siemens.com/support)
- 3. Review the V4.0 release notes and migration guide for any pre-upgrade requirements
- 4. Stop the SINEC NMS services
- 5. Install SINEC NMS V4.0 following the product installation documentation
- 6. Restore the configuration from the backup taken in step 1
- 7. Verify the installation by logging into the web interface and checking that all services are running
- 8. Validate that file upload functionality works correctly after the upgrade
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-40737 — 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-2025-40737 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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- Version or environment caveats, and links to real fixes
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