dbcve.org
Sinec NmsApplication · Siemens

CVE-2026-25656

HIGH · 7.8 CVSS v3.1 Published 2026-02-10
Fix available
A fix is available. Upgrade to 2.15.2.1 or later.
See remediation →
80/100
Remediation priority · High
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 SP3), User Management Component (UMC) (All versions < V2.15.2.1). The affected application permits improper modification of a configuration file by a low-privileged user. This could allow an attacker to load malicious DLLs, potentially leading to arbitrary code execution with SYSTEM privileges.(ZDI-CAN-28108)

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

The vulnerability allows low-privileged users to improperly modify configuration files in SINEC NMS and User Management Component (UMC). This enables DLL hijacking, where an attacker can inject a malicious DLL that gets loaded by the application, resulting in arbitrary code execution with SYSTEM privileges.

MitigationUpgrade SINEC NMS to version V4.0 SP3 or later and UMC to version V2.15.2.1 or later. Verify configuration file integrity post-upgrade.

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:all versions
User Management ComponentApplication
Affected:< 2.15.2.1

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
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/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 checks

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

  1. Identify if Siemens SINEC NMS is installed
    Check common installation directories such as C:\Program Files\Siemens\SINEC\NMS or C:\Program Files (x86)\Siemens\SINEC\NMS. Also search the Windows registry under HKLM\SOFTWARE\Siemens\SINEC NMS for installation paths.
    Affected if SINEC NMS is found on the system in any version (all versions are affected per CVE).
  2. Identify if Siemens User Management Component (UMC) is installed
    Check common installation directories such as C:\Program Files\Siemens\User Management Component or C:\Program Files (x86)\Siemens\User Management Component. Also search the Windows registry under HKLM\SOFTWARE\Siemens\UMC for installation paths.
    Affected if UMC is found with a version lower than 2.15.2.1.
  3. Check UMC version
    Locate the UMC installation directory and check for a version file (typically version.dll, version.txt, or in the About dialog accessible from the application). Compare the installed version against the affected range: versions prior to 2.15.2.1 are vulnerable.
    Affected if Installed UMC version is less than 2.15.2.1.
  4. Verify configuration file permissions
    Navigate to the SINEC NMS or UMC configuration directory (commonly found in the installation folder under config or conf subdirectory). Right-click configuration files (XML, JSON, INI, or config files) and view Properties > Security to check write permissions for non-administrator users.
    Affected if Configuration files are writable by standard users or low-privileged accounts.
  5. Inspect for suspicious DLL files in application directories
    Scan the SINEC NMS and UMC installation directories for unknown or recently added DLL files that may indicate DLL hijacking attempts. Pay attention to DLLs located in the same directory as executable files.
    Affected if Unexpected or unauthorized DLL files are present in the application directories.

A system is affected if SINEC NMS of any version or UMC version lower than 2.15.2.1 is installed AND low-privileged users have write access to application configuration files.

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 2.15.2.1 or later
Fixed in 2.15.2.1
Interim mitigation

Upgrade SINEC NMS to version V4.0 SP3 or later and UMC to version V2.15.2.1 or later. Verify configuration file integrity post-upgrade.

Recommended fix High confidence

SINEC NMS: V4.0 SP3 or later; User Management Component (UMC): V2.15.2.1 or later

  1. Identify the currently installed versions of SINEC NMS and User Management Component (UMC)
  2. Verify the installed versions are below the fixed releases (SINEC NMS < V4.0 SP3, UMC < V2.15.2.1)
  3. Obtain the fixed versions from Siemens (SINEC NMS V4.0 SP3 or later, UMC V2.15.2.1 or later)
  4. Plan and schedule the upgrade following Siemens documentation and change management procedures
  5. Apply the upgrade to SINEC NMS and/or User Management Component
  6. Verify the upgrade was successful and the vulnerability is remediated

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

Fix this in Sinec Nms Scoped from the published advisory
  • Consultation4.0 h
  • Implementation6.0 h
  • Testing8.0 h
  • Review / QA3.0 h
21.0 hours of engineering $3,620
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,792.

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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-2026-25656 in production — separate from our analysis above.

No notes yet

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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