CVE-2007-3819
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 · uneditedOpera 9.21 allows remote attackers to spoof the data: URI scheme in the address bar via a long URI with trailing whitespace, which prevents the beginning of the URI from being displayed.
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 · moderate confidenceIn Opera 9.21, a URI spoofing vulnerability exists where a long URI containing trailing whitespace causes the address bar to display only the end of the URI. This prevents users from seeing the beginning of the URL, potentially hiding the 'data:' scheme prefix and allowing attackers to disguise malicious content as legitimate sites.
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= 9.21CVSS 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
- None
- Integrity
- Partial
- Availability
- None
AV:N/AC:L/Au:N/C:N/I:P/A:N
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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Confirm Opera Browser is installedLocate the Opera executable (opera.exe on Windows, Opera on macOS/Linux) in the system or check program files directoriesAffected if Opera Browser exists on the system
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Identify installed Opera versionOpen Opera, then access Help > About Opera or type opera:about in the address bar to display the version informationAffected if The version shown is exactly 9.21
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Verify the URI spoofing conditionManually construct a long URI with trailing whitespace (for example: a long string followed by spaces, such as a data: URI with excessive trailing whitespace) and observe how it displays in the address barAffected if The address bar shows only the end portion of the URI and hides the beginning (including potentially the scheme)
If Opera Browser version 9.21 is installed and the address bar truncates long URIs with trailing whitespace to hide the beginning/scheme, the environment is affected by this vulnerability.
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 a newer version of Opera that properly handles trailing whitespace in URIs and ensures the address bar displays the complete URI or at minimum the scheme identifier. Until then, users should verify URLs through other means and avoid clicking suspicious links.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
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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-2007-3819 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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