CVE-2025-36853
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 (CVE-2025-21172) exists in msdia140.dll due to integer overflow and heap-based overflow. Per CWE-122: Heap-based Buffer Overflow, a heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Per CWE-190: Integer Overflow or Wraparound, is when a product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number. NOTE: This CVE affects only End Of Life (EOL) software components. The vendor, Microsoft, has indicated there will be no future updates nor support provided upon inquiry.
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 confidenceA heap-based buffer overflow vulnerability exists in msdia140.dll (Microsoft Visual C++ Redistributable debug information viewer) caused by an integer overflow that allows a calculation to wraparound, resulting in insufficient memory allocation. This can be exploited to overwrite adjacent heap memory.
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
- Network
- Complexity
- High
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/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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Locate msdia140.dll on the systemSearch for msdia140.dll in common system directories: C:\Windows\System32\, C:\Program Files\Microsoft Visual Studio\, or search the entire system using: dir /s C:\msdia140.dll or Get-ChildItem -Recurse -Filter msdia140.dll on PowerShellAffected if The file exists on the system (indicating Visual C++ Redistributable debug info viewer components are installed)
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Determine the file version of msdia140.dllRight-click the DLL file, select Properties, then check the Version tab. Alternatively, use PowerShell: (Get-Item 'C:\Path\To\msdia140.dll').VersionInfo or run 'msdia140.dll' version info via command line toolsAffected if The DLL version exists but cannot be compared to a patched version (no vendor patch available for this EOL component)
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Identify processes or applications that load msdia140.dllUse Process Explorer or Process Monitor to detect which running processes have msdia140.dll loaded, or run: tasklist /m msdia140.dllAffected if Applications are actively invoking the DLL for debug information viewing functionality
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Audit for unused or unnecessary Visual C++ debug toolingReview installed programs for Visual C++ Redistributable debug information viewer, Visual Studio debug tools, or related components that ship msdia140.dllAffected if The DLL is present from a Visual Studio or Redistributable installation that is not actively needed for development or debugging workflows
The system is affected if msdia140.dll is present and accessible to applications that process debug information files, as the integer overflow vulnerability can be triggered during heap allocation calculations.
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 dataSince this affects EOL software with no vendor patches forthcoming, mitigate by removing msdia140.dll if unused, restricting access to applications that invoke it, or implementing application-layer/network controls to limit exposure to untrusted files that trigger this DLL.
- Consultation8.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA4.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2025-36853 — 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-2025-36853 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
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