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FirefoxWeb browser · Mozilla

CVE-2011-0081

HIGH · 10.0 CVSS v2.0 Published 2011-05-07
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click Patch available

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
Unspecified vulnerability in the browser engine in Mozilla Firefox 3.6.x before 3.6.17 and 4.x before 4.0.1, and Thunderbird 3.1.x before 3.1.10, allows remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown vectors.

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

Memory corruption vulnerability in Mozilla's browser engine affecting Firefox 3.6.x before 3.6.17, Firefox 4.x before 4.0.1, and Thunderbird 3.1.x before 3.1.10. Allows remote attackers to cause denial of service through memory corruption and potentially execute arbitrary code via unknown vectors.

MitigationUpgrade to Firefox 3.6.17+, 4.0.1+, or Thunderbird 3.1.10+ respectively. If upgrading is not possible, consider restricting browser/email client usage or deploying additional network-level controls.

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:= 3.6.1= 3.6.2= 3.6.3= 3.6.4= 3.6.6= 3.6.7= 3.6.8= 3.6.9= 3.6.10= 3.6.11= 3.6.12= 3.6.13
ThunderbirdApplication
Affected:= 3.1.1= 3.1.2= 3.1.3= 3.1.4= 3.1.5= 3.1.6= 3.1.7= 3.1.8= 3.1.9

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
Complete
Integrity
Complete
Availability
Complete

AV:N/AC:L/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 checks

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

  1. Identify installed Mozilla product
    Check whether Firefox or Thunderbird is installed on the system by looking for the application in the system program files or by running 'firefox --version' or 'thunderbird --version' from the command line
    Affected if The system has Firefox or Thunderbird installed
  2. Check Firefox version number
    Run 'firefox --version' or access Help > About Firefox to retrieve the exact version string
    Affected if The version is Firefox 3.6.1 through 3.6.13 inclusive, or any 3.6.x version before 3.6.17, or any 4.x version before 4.0.1
  3. Check Thunderbird version number
    Run 'thunderbird --version' or access Help > About Thunderbird to retrieve the exact version string
    Affected if The version is Thunderbird 3.1.1 through 3.1.9 inclusive, or any 3.1.x version before 3.1.10
  4. Confirm browser or email client is used to process web/email content
    Verify that the installed Firefox or Thunderbird is configured as the default browser or email client and is used to render web pages or process emails
    Affected if The vulnerable application is actively used to process untrusted web content or email messages, which triggers the memory corruption via unknown vectors

A system is affected if it runs Firefox versions 3.6.x before 3.6.17, Firefox 4.x before 4.0.1, or Thunderbird 3.1.x before 3.1.10 and uses the application to process web or email content.

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.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch bugzilla.mozilla.org →
Interim mitigation

Upgrade to Firefox 3.6.17+, 4.0.1+, or Thunderbird 3.1.10+ respectively. If upgrading is not possible, consider restricting browser/email client usage or deploying additional network-level controls.

Recommended fix High confidence

Firefox 3.6.17 or later / Thunderbird 3.1.10 or later; alternatively, migrate to latest supported releases

  1. Upgrade Firefox 3.6.x to version 3.6.17 or later (or migrate to a supported modern Firefox version)
  2. Upgrade Thunderbird 3.1.x to version 3.1.10 or later (or migrate to a supported modern Thunderbird version)
Caveat Firefox 4.x and Thunderbird 3.1.x are end-of-life; upgrading to 3.6.17 or 3.1.10 maintains the same major version branch with security fixes only

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Firefox Scoped from the published advisory
  • Consultation1.0 h
  • Implementation1.0 h
  • Testing2.0 h
  • Review / QA1.0 h
5.0 hours of engineering $860
Get the patch applied

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,376.

Scan for this in your stack

Free · runs locally
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-2011-0081 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