CVE-2025-40798
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 SIMATIC PCS neo V4.1 (All versions), SIMATIC PCS neo V5.0 (All versions), SIMATIC PCS neo V6.0 (All versions < V6.0 SP1 Update 1), User Management Component (UMC) (All versions < V2.15.1.3). Affected products contain a out-of-bounds read vulnerability in the integrated UMC component. This could allow an unauthenticated remote attacker to cause a denial of service condition.
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 confidenceAn out-of-bounds read vulnerability exists in the User Management Component (UMC) of SIMATIC PCS neo V4.1, V5.0, V6.0 (< V6.0 SP1 Update 1), and UMC (< V2.15.1.3). An unauthenticated remote attacker can trigger this flaw to cause a denial of service condition.
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= 4.1= 5.0< 2.15.1.3CVSS 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
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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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Check if SIMATIC PCS neo is installedLocate the SIMATIC PCS neo installation in your environment and identify the installed version numberAffected if The installed version is 4.1, 5.0, or 6.0 without the V6.0 SP1 Update 1 applied
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Check the SIMATIC PCS neo version against affected rangeCompare your installed version to the affected ranges: V4.1, V5.0, or V6.0 (pre-SP1 Update 1)Affected if The version is 4.1, 5.0, or any V6.0 version prior to SP1 Update 1
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Identify if User Management Component (UMC) is presentLocate the UMC installation or component within your SIMATIC PCS neo environmentAffected if UMC is installed as part of the SIMATIC PCS neo system
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Check UMC versionDetermine the installed version of the User Management ComponentAffected if The UMC version is below V2.15.1.3 (or version cannot be determined but UMC is present on an affected PCS neo version)
You are affected if SIMATIC PCS neo V4.1, V5.0, or V6.0 (without SP1 Update 1) is running, or if UMC version is below V2.15.1.3 on any PCS neo version.
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 · scoped2.15.1.3
Apply the vendor-supplied updates: upgrade SIMATIC PCS neo to V6.0 SP1 Update 1 or later, and UMC to V2.15.1.3 or later. Prioritize testing in a staging environment before production deployment to ensure compatibility.
SIMATIC PCS neo: V6.0 SP1 Update 1 or later; User Management Component: V2.15.1.3 or later
- Identify the currently installed version of SIMATIC PCS neo or User Management Component (UMC)
- For SIMATIC PCS neo V4.1 and V5.0: Plan migration to SIMATIC PCS neo V6.0 SP1 Update 1 or later as these versions have no direct patch
- For SIMATIC PCS neo V6.0: Upgrade to V6.0 SP1 Update 1 or later
- For User Management Component (UMC): Upgrade to version 2.15.1.3 or later
- After upgrading, verify the UMC component is no longer vulnerable to out-of-bounds read
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing12.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-40798 — 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-2025-40798 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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