dbcve.org
Sinec NmsApplication · Siemens

CVE-2025-40736

CRITICAL · 9.8 CVSS v3.1 Published 2025-07-08
Fix available
A fix is available. Upgrade to 4.0 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

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 · unedited
A vulnerability has been identified in SINEC NMS (All versions < V4.0). The affected application exposes an endpoint that allows an unauthorized modification of administrative credentials. This could allow an unauthenticated attacker to reset the superadmin password and gain full control of the application (ZDI-CAN-26569).

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 confidence

SINEC NMS versions before V4.0 contain an unauthenticated password reset vulnerability in an exposed endpoint. Attackers can reset the superadmin password without authentication, achieving full administrative control over the network management system.

MitigationUpgrade SINEC NMS to version V4.0 or later to remediate this vulnerability. If immediate patching is not feasible, implement network segmentation to restrict access to the application interface.

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
Sinec NmsApplication
Affected:< 4.0

CVSS 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
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify SINEC NMS installation and version
    Locate the SINEC NMS installation and check the installed version number. This may be visible in the application web interface header, in installed software listings, or in version files within the SINEC NMS installation directory. Compare the found version against the affected range (versions before V4.0).
    Affected if Installed version is below V4.0
  2. Verify the password reset endpoint is network-accessible
    Determine if the SINEC NMS web interface is reachable over the network. The vulnerability exists in an exposed endpoint. Check whether the application is accessible from untrusted networks or directly from the internet rather than only from a trusted internal segment.
    Affected if The SINEC NMS interface is reachable from an untrusted network or the internet
  3. Confirm superadmin account exists
    Verify that the superadmin account is configured in the SINEC NMS system. This account is the target of the unauthenticated password reset. Check user management or confirm the presence of this administrative account.
    Affected if Superadmin account is present in the system
  4. Assess authentication requirements on password reset
    Attempt to access or inspect the password reset functionality. The vulnerability allows password reset without any authentication credentials. Determine whether the endpoint accepts requests without requiring valid session tokens or credentials.
    Affected if Password reset endpoint accepts unauthenticated requests

User is affected if SINEC NMS version is below V4.0 AND the application interface is network-accessible, allowing unauthenticated password reset attempts.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Upgrade available Upgrade to 4.0 or later
Fixed in 4.0
Interim mitigation

Upgrade SINEC NMS to version V4.0 or later to remediate this vulnerability. If immediate patching is not feasible, implement network segmentation to restrict access to the application interface.

Recommended fix High confidence

SINEC NMS V4.0

  1. Download SINEC NMS version V4.0 or later from the official Siemens download portal (cert-portal.siemens.com or Siemens Industry Online Support)
  2. Review the upgrade documentation specific to SINEC NMS for the migration path from earlier versions
  3. Ensure a complete backup of the current SINEC NMS configuration and database is performed before upgrade
  4. Stop all SINEC NMS services prior to initiating the upgrade
  5. Execute the upgrade installer for version V4.0 following the documented installation procedures
  6. After upgrade completion, verify that the superadmin account is accessible with the expected credentials
  7. Confirm that the vulnerable endpoint no longer allows unauthenticated access to credential modification functions
Caveat Review Siemens release notes for V4.0 regarding any deprecated features, compatibility changes, or required migration procedures from older versions

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Sinec Nms Scoped from the published advisory
  • Consultation6.0 h
  • Implementation12.0 h
  • Testing10.0 h
  • Review / QA6.0 h
34.0 hours of engineering $5,940
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $9,504.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-40736 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • 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
  • No spam, self-promotion, credentials, or personal data