CVE-2006-5270
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 · uneditedInteger overflow in the Microsoft Malware Protection Engine (mpengine.dll), as used by Windows Live OneCare, Antigen, Defender, and Forefront Security, allows user-assisted remote attackers to execute arbitrary code via a crafted PDF file.
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 confidenceInteger overflow vulnerability in Microsoft Malware Protection Engine (mpengine.dll) allows arbitrary code execution when scanning crafted PDF files. The flaw exists in how the engine handles malformed PDF content during antivirus scanning, leading to heap overflow and code execution under the context of the scanning service.
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 dataall versionsall versionsall versionsall versionsall versionsCVSS 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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Identify installed Microsoft security productsCheck Add/Remove Programs or program files for presence of Windows Defender, Windows Live OneCare, Microsoft Forefront Security, or Microsoft AntigenAffected if Any of these products are installed on the system
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Locate mpengine.dll versionSearch for mpengine.dll in the program directories (typically in the security product folder, e.g., C:\Program Files\Windows Defender, C:\Program Files\Windows Live\OneCare, or C:\Program Files\Microsoft Forefront) and check file properties for version informationAffected if mpengine.dll is found and its version is unpatched (the vulnerability affects all versions)
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Verify real-time scanning is enabledCheck the security product settings or Windows services to confirm that real-time protection or on-access scanning is turned onAffected if Real-time/on-access scanning is enabled and the product scans PDF files automatically
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Confirm PDF scanning capabilityCheck the security product configuration to verify it is set to scan PDF files (this is typically enabled by default in these products)Affected if PDF file types are included in the scan scope
The environment is affected if any of the affected Microsoft security products (Windows Defender, Windows Live OneCare, Forefront Security, or Antigen) are installed with mpengine.dll present and real-time scanning enabled to automatically scan PDF files.
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 Microsoft security updates for affected products (Windows Live OneCare, Antigen, Defender, Forefront Security) to obtain patched mpengine.dll version. Ensure real-time scanning does not automatically open or preview suspicious files without user confirmation.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2006-5270 — 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-2006-5270 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
- No spam, self-promotion, credentials, or personal data