CVE-2011-2633
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 · uneditedUnspecified vulnerability in Opera before 11.11 allows remote attackers to cause a denial of service (application crash) via vectors involving a Certificate Revocation List (CRL) file, as demonstrated by the multicert-ca-02.crl 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 · moderate confidenceOpera browser versions before 11.11 contain an unspecified vulnerability in Certificate Revocation List (CRL) file handling. When processing a specially crafted CRL file (demonstrated by multicert-ca-02.crl), the browser crashes, resulting in a denial of service condition.
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<= 11.10= 5.0= 5.02= 5.10= 5.11= 5.12= 6.0= 6.1= 6.01= 6.02= 6.03= 6.04CVSS 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
- None
- Availability
- Partial
AV:N/AC:L/Au:N/C:N/I:N/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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Check if Opera browser is installedLook for Opera executable in typical installation locations: Windows: C:\Program Files\Opera\opera.exe or C:\Program Files (x86)\Opera\opera.exe; macOS: /Applications/Opera.app; Linux: /usr/bin/opera or /usr/local/bin/opera. Also check Start menu or Applications folder.Affected if Opera browser is found on the system
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Determine the installed Opera versionRun 'opera --version' from command line, or right-click opera.exe and select Properties > Details to view File Version, or open Opera and go to Help > About OperaAffected if The displayed version is 11.10 or lower, or any of these specific versions: 5.0, 5.02, 5.10, 5.11, 5.12, 6.0, 6.1, 6.01, 6.02, 6.03, 6.04
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Verify the vulnerability trigger conditionThis vulnerability is triggered when Opera processes a specially crafted Certificate Revocation List (CRL) file. The CRL handling is part of Opera's SSL/TLS certificate validation used when browsing HTTPS sites or when importing CRL files.Affected if The browser is used to access HTTPS websites or process CRL files, which are standard certificate validation operations in Opera
A user is affected if Opera browser version 11.10 or lower (or any of the specific older versions 5.0 through 6.04) is installed and used for browsing or certificate validation.
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 Opera to version 11.11 or later to patch the CRL handling vulnerability. Since Opera has been discontinued, consider migrating to a supported browser as a longer-term solution.
- Consultation1.0 h
- Implementation1.0 h
- Testing1.0 h
- Review / QA0.5 h
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Free · runs locallyCheck whether your project pulls in CVE-2011-2633 — 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-2011-2633 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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