CVE-2008-5331
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 · uneditedAdobe Acrobat 9 uses more efficient encryption than previous versions, which makes it easier for attackers to guess a document's password via a brute-force attack.
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 confidenceAdobe Acrobat 9 implements a more computationally efficient encryption algorithm compared to its predecessors, which reduces the computational work required for each password guess. This weakens the effective security of password-protected PDF documents, making brute-force password attacks significantly more feasible.
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= 9= 9.0CVSS 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
- Authentication
- None
- Confidentiality
- Partial
- Integrity
- Partial
- Availability
- Partial
AV:N/AC:L/Au:N/C:P/I:P/A:P
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 Adobe Acrobat versionOpen Adobe Acrobat, then go to Help > About Adobe Acrobat (or on Windows, check Programs and Features for Adobe Acrobat 9.x). Alternatively, right-click any PDF file, select Properties, and check the Product name field in the Details tab if available.Affected if The installed version is Adobe Acrobat 9.0 or Adobe Acrobat 9 (any 9.x release)
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Determine if password protection is in useAttempt to open PDF files in the environment. Look for prompt requesting a password on document open, or check PDF properties/attributes for encryption flags. On Windows, examine PDF files with a hex editor or use a PDF parsing tool to inspect the /Encrypt dictionary in the PDF structure.Affected if Password-protected PDF documents exist that were created with Adobe Acrobat 9's built-in encryption feature
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Verify PDF encryption settingsOpen a password-protected PDF in Adobe Acrobat 9 and check the document security settings (File > Properties > Security). Alternatively, use a PDF analysis tool to inspect the encryption handler and key length used.Affected if The security method shows 'Standard' or 'Adobe Acrobat Security' with encryption enabled - indicating the vulnerable encryption path is in use
You are affected if Adobe Acrobat 9.x is installed AND password-protected PDF documents using the built-in encryption feature exist in your environment.
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 Adobe security patches as they become available. In the interim, use longer, more complex passwords to increase brute-force difficulty, and implement additional access controls around sensitive PDF documents.
- Consultation8.0 h
- Implementation4.0 h
- Testing4.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2008-5331 — 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-2008-5331 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