CVE-2011-4521
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 · uneditedSQL injection vulnerability in Advantech/BroadWin WebAccess before 7.0 allows remote attackers to execute arbitrary SQL commands via crafted string input.
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 confidenceSQL injection vulnerability in Advantech/BroadWin WebAccess versions before 7.0 allows remote unauthenticated attackers to execute arbitrary SQL commands via crafted string input fields that are not properly sanitized before being used in database queries.
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<= 6.0= 5.0CVSS 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 WebAccess installation and versionLocate the Advantech/BroadWin WebAccess installation directory or check system inventory/asset management tools for the installed software version. Common locations include C:\Program Files\BroadWin\WebAccess or C:\Advantech\WebAccess on Windows systems.Affected if The installed version is 6.0 or lower, or specifically version 5.0
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Verify web interface is exposedConfirm that the WebAccess web server/service (typically on ports 80 or 443, or custom ports like 8080) is running and accessible from network segments. Check service configuration for enabled web nodes.Affected if The web interface is enabled and network-accessible, making the SQL injection vector remotely exploitable
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Check for unauthenticated input fieldsExamine the WebAccess login and data entry pages for string input fields (such as username, search fields, or parameter inputs) that can be accessed without authentication. These are the entry points for the SQL injection.Affected if Unauthenticated users can access input fields without requiring login credentials
If WebAccess version 6.0 or below (including 5.0) is installed with the web interface accessible to unauthenticated users, the environment is vulnerable to CVE-2011-4521 SQL injection attacks.
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 dataUpgrade to WebAccess version 7.0 or later to obtain patched code, and implement parameterized queries or proper input validation as defense-in-depth for any remaining legacy systems.
- Consultation6.0 h
- Implementation12.0 h
- Testing10.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2011-4521 — 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-2011-4521 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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