CVE-2007-1756
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 · uneditedMicrosoft Excel 2000 SP3, 2002 SP3, 2003 SP2, 2003 Viewer, and Office Excel 2007 does not properly validate version information, which allows user-assisted remote attackers to execute arbitrary code via a crafted Excel file, aka "Calculation Error Vulnerability".
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 confidenceThis is a validation error vulnerability in Microsoft Excel where the software fails to properly validate version information when processing Excel files. Attackers can exploit this by crafting malicious Excel files that, when opened by a user, allow arbitrary code execution with the privileges of the logged-in user.
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= 2000= 2002= 2003= 2007= 2003= 2000= 2003= 2007= xpCVSS 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
- M
- Authentication
- None
- Confidentiality
- Complete
- Integrity
- Complete
- Availability
- Complete
AV:N/AC:M/Au:N/C:C/I:C/A:C
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 Microsoft Excel is installedLocate Excel.exe in typical installation paths (C:\Program Files\Microsoft Office\OfficeXX\EXCEL.EXE or C:\Program Files (x86)\Microsoft Office\OfficeXX\EXCEL.EXE) or check the Windows registry under HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\EXCEL.EXEAffected if Excel.exe exists on the system and its version matches 2000, 2002, 2003, or 2007
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Determine the installed Excel version numberRight-click Excel.exe, select Properties, then view the Details tab for Product Version, or open Excel and go to Help > About Microsoft ExcelAffected if The reported version is 9.0 (Excel 2000), 10.0 (Excel 2002), 11.0 (Excel 2003), or 12.0 (Excel 2007)
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Check if Microsoft Office with Excel component is installedCheck Windows registry under HKLM\SOFTWARE\Microsoft\Office\<version>\Excel\InstallRoot or HKLM\SOFTWARE\Microsoft\Office\ClickToRun\Office16\RootInstallation\existingAffected if Office is installed with Excel component and the Office version matches 2000, 2003, 2007, or XP (Office version 10.0)
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Confirm the vulnerability trigger conditionThis vulnerability is triggered when a user opens a specially crafted Excel file that contains malformed version informationAffected if Users on affected systems open Excel files, particularly from untrusted or unknown sources, enabling arbitrary code execution
The environment is affected if Microsoft Excel version 2000, 2002, 2003, or 2007, or Microsoft Office containing Excel versions 2000, 2003, 2007, or XP is installed, and users process Excel files with the vulnerable version validation component.
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 dataApply the Microsoft security update (MS07-025) to all affected Excel installations. Until patched, users should not open Excel files from untrusted sources and should maintain up-to-date antivirus software.
- Consultation1.0 h
- Implementation2.0 h
- Testing1.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2007-1756 — 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-2007-1756 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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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.
- 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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