CVE-2025-12852
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 · uneditedDLL Loading vulnerability in NEC Corporation RakurakuMusen Start EX All Verisons allows a attacker to manipulate the PC environment to cause unintended operations on the user's device.
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 confidenceA DLL loading vulnerability in NEC RakurakuMusen Start EX allows attackers to manipulate the PC environment (likely by placing malicious DLL files in accessible locations) causing the application to load unintended DLLs and perform unauthorized operations on the user's device.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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
- None
- Authentication
- X
- User interaction
- A
- Scope
- X
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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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Verify if NEC RakurakuMusen Start EX is installedCheck for the application in the Windows registry under HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall or look for the executable (typically in C:\Program Files\NEC\RakurakuMusen Start EX or similar paths)Affected if The application is present on the system
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Identify the installed application versionRight-click the application executable, select Properties, and check the Details tab for the version number, or use PowerShell: Get-Item 'C:\Program Files\NEC\RakurakuMusen Start EX\*.exe' | Select-Object Name, VersionInfoAffected if A version is found that matches the affected product range (if known) or any version if no version data is available
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Check application directory permissionsRight-click the application installation folder, go to Properties > Security, and verify which users have Write or Modify permissions. Alternatively, run: icacls 'C:\Program Files\NEC\RakurakuMusen Start EX'Affected if Non-privileged users have Write or Modify access to the application directory, allowing them to place malicious DLLs
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Inspect DLL search path configurationUse Process Monitor from Sysinternals to trace DLL loading events when the application launches, or check if the application uses unsafe DLL loading functions (LoadLibrary with relative paths). Look for DLLs being loaded from the current working directory.Affected if The application loads DLLs from the current directory or uses relative paths without proper validation
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Scan for suspicious DLLs in application-accessible locationsCheck the application directory and user-writable locations (Desktop, Downloads, Documents) for unexpected DLL files that could be planted. Run: Get-ChildItem -Path 'C:\Program Files\NEC\RakurakuMusen Start EX' -Filter '*.dll' -Recurse | Select-Object Name, LastWriteTimeAffected if Unexpected or recently modified DLL files exist in the application directory or accessible paths
If NEC RakakunMusen Start EX is installed and its directory or accessible paths are writable by untrusted users, the DLL hijacking vulnerability can be exploited.
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.
From vendor dataImplement secure DLL loading by using absolute paths, removing current directory from DLL search order, and digitally signing all DLLs to prevent tampering. Verify all loaded DLLs originate from trusted sources before execution.
- Consultation4.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $7,040.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-12852 — 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-2025-12852 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
- No spam, self-promotion, credentials, or personal data