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FirefoxWeb browser · Mozilla

CVE-2011-3665

HIGH · 7.5 CVSS v2.0 Published 2011-12-21
Fix available
A fix is available. Upgrade to after 2.5 or later.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

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 · unedited
Mozilla Firefox 4.x through 8.0, Thunderbird 5.0 through 8.0, and SeaMonkey before 2.6 allow remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via an Ogg VIDEO element that is not properly handled after scaling.

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 confidence

A vulnerability in Mozilla Firefox 4.x-8.0, Thunderbird 5.0-8.0, and SeaMonkey before 2.6 allows remote attackers to cause a denial of service via an Ogg VIDEO element that is not properly handled after scaling, leading to application crash or potentially other unspecified impact.

MitigationUpdate affected Mozilla products to Firefox 8.0+, Thunderbird 8.0+, or SeaMonkey 2.6+ to obtain the vendor patch for this vulnerability.

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
FirefoxWeb browser
Affected:= 4.0= 4.0.1= 5.0= 5.0.1= 6.0= 6.0.1= 6.0.2= 7.0= 7.0.1= 8.0
SeamonkeyApplication
Affected:<= 2.5= 1.0= 1.0.1= 1.0.2= 1.0.3= 1.0.4= 1.0.5= 1.0.6= 1.0.7= 1.0.8= 1.0.9= 1.0.99
ThunderbirdApplication
Affected:= 5.0= 6.0= 6.0.1= 6.0.2= 7.0= 7.0.1= 8.0

CVSS 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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify the installed Mozilla product
    Open the application and navigate to Help > About (Firefox/Thunderbird) or Help > About SeaMonkey to see the product name and version
    Affected if The product is Firefox, Thunderbird, or SeaMonkey
  2. Determine the exact version number
    Note the full version number displayed in the About dialog (for example, 7.0.1, 6.0.2, or 2.5)
    Affected if The version falls within the affected ranges: Firefox 4.0-8.0, Thunderbird 5.0-8.0, or SeaMonkey 2.5 and earlier
  3. Check if Ogg VIDEO support is enabled
    In Firefox, type 'about:config' in the address bar, then search for 'media.ogg' related preferences. Look for 'media.video.enabled' or 'media.ogg.enabled' and verify if they are set to true
    Affected if Ogg VIDEO support is enabled (the vulnerability requires an Ogg VIDEO element to be processed)

You are affected if you run Firefox 4.0-8.0, Thunderbird 5.0-8.0, or SeaMonkey 2.5 or earlier with Ogg VIDEO support enabled and a scaled Ogg VIDEO element is processed.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Upgrade available Upgrade to a release after 2.5
Interim mitigation

Update affected Mozilla products to Firefox 8.0+, Thunderbird 8.0+, or SeaMonkey 2.6+ to obtain the vendor patch for this vulnerability.

Fix this in Firefox Scoped from the published advisory
  • Consultation1.0 h
  • Implementation1.0 h
  • Testing1.0 h
  • Review / QA1.0 h
4.0 hours of engineering $750
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,200.

Scan for this in your stack

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dbcve dependency scanner

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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 sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2011-3665 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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