CVE-2009-3831
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 before 10.01 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted domain name.
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 confidenceOpera browser versions before 10.01 contain a memory corruption vulnerability when processing specially crafted domain names. This can lead to arbitrary code execution or denial of service via application crash.
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< 10.01CVSS 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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Check if Opera browser is installedLocate the Opera executable on the system. Common locations include Program Files directories on Windows or Application folders on other operating systems. Look for opera.exe or similar Opera binary files.Affected if Opera browser is found installed on the system
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Determine the installed Opera versionAccess the Opera browser's About section. In the browser, navigate to Help > About Opera, or locate version information in the browser's executable properties. Note the full version number displayed.Affected if The installed version is lower than 10.01 (for example, 10.00, 9.x, or earlier versions)
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Confirm the vulnerability trigger conditionThe vulnerability is triggered when Opera processes specially crafted domain names. This occurs during normal browser operation when resolving domain names entered in the address bar or loaded via web content.Affected if Opera is actively used to browse the web or process domain names, and the installed version is below 10.01
A user is affected if Opera browser is installed with a version number less than 10.01 and the browser is used to process domain names (standard web browsing).
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.
dbcve · scoped10.01
Upgrade Opera to version 10.01 or later. If upgrade is not feasible, restrict browsing to trusted domains and consider deploying alternative browsers.
Opera 10.01 or later (recommended: latest stable version)
- 1. Open the Opera browser
- 2. Navigate to the Opera menu (or press Alt+P)
- 3. Select 'Help' and then 'Check for updates' to see available versions
- 3. Alternatively, visit the official Opera website at www.opera.com to download the latest version
- 4. Download and install the latest Opera browser version
- 5. After installation, verify the version by navigating to opera:about in the address bar
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Implementation2.0 h
- Testing1.0 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 $1,424.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2009-3831 — 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-2009-3831 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