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FirefoxWeb browser · Mozilla

CVE-2011-2376

HIGH · 10.0 CVSS v2.0 Published 2011-06-30
Fix available
A fix is available. Upgrade to after 3.6.17 or later.
See remediation →
100/100
Remediation priority · Urgent
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
Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 3.6.18 and Thunderbird before 3.1.11 allow 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

Multiple memory corruption vulnerabilities in the Gecko browser engine of Mozilla Firefox before 3.6.18 and Thunderbird before 3.1.11 allow remote attackers to cause denial of service or potentially execute arbitrary code via unknown vectors.

MitigationUpgrade to Firefox 3.6.18 or later, or Thunderbird 3.1.11 or later. For legacy systems that cannot upgrade, consider deploying compensating controls such as network segmentation and restricting browser usage.

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:<= 3.6.17= 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= 1.5= 1.5.0.1
ThunderbirdApplication
Affected:<= 3.1.10= 0.1= 0.2= 0.3= 0.4= 0.5= 0.6= 0.7= 0.7.1= 0.7.2= 0.7.3= 0.8

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 products
    Check for Firefox or Thunderbird installations. On Windows: look in Program Files. On Linux: run 'dpkg -l | grep -i firefox' or 'rpm -qa | grep -i thunderbird'. On Mac: check /Applications folder.
    Affected if Either Firefox or Thunderbird is installed on the system
  2. Check Firefox version
    Open Firefox, go to Help > About Firefox, or run 'firefox --version' from command line. On Windows, check the version in the application's properties.
    Affected if Version is 3.6.17 or lower, or any 1.0.x, 1.5, or 1.5.0.x version
  3. Check Thunderbird version
    Open Thunderbird, go to Help > About Thunderbird, or run 'thunderbird --version' from command line. On Windows, check the version in the application's properties.
    Affected if Version is 3.1.10 or lower, or any 0.x version through 0.8
  4. Confirm Gecko engine version if available
    In Firefox or Thunderbird, navigate to about:config and check the 'app.version' or 'platform.version' property to confirm the underlying Gecko engine version.
    Affected if Gecko engine version corresponds to an affected Firefox or Thunderbird release

You are affected if any installed Firefox is version 3.6.17 or lower, or version 1.0.x/1.5.x, or any installed Thunderbird is version 3.1.10 or lower, or version 0.1 through 0.8.

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
Upgrade available Upgrade to a release after 3.6.17
Interim mitigation

Upgrade to Firefox 3.6.18 or later, or Thunderbird 3.1.11 or later. For legacy systems that cannot upgrade, consider deploying compensating controls such as network segmentation and restricting browser usage.

Recommended fix High confidence

Firefox 3.6.18+ or modern Firefox 115+ ESR/120+; Thunderbird 3.1.11+ or modern Thunderbird 115+

  1. 1. Check current Firefox version by navigating to Help > About Firefox
  2. 2. Check current Thunderbird version by navigating to Help > About Thunderbird
  3. 3. If Firefox version is 3.6.x (3.6.17 or earlier) or 1.0.x series, download and install Firefox 3.6.18 or later from mozilla.org
  4. 4. If Thunderbird version is 3.1.x (3.1.10 or earlier) or 0.x series, download and install Thunderbird 3.1.11 or later from mozilla.org
  5. 5. Alternatively, upgrade to a modern supported Firefox release (currently Firefox 115+ ESR or Firefox 120+) for continued security updates
  6. 6. Alternatively, upgrade to a modern supported Thunderbird release (currently Thunderbird 115+) for continued security updates
  7. 7. After upgrade, restart the application and verify the version in Help > About
Caveat Firefox 3.6.x and Thunderbird 3.1.x are end-of-life and no longer receive security updates; upgrading to modern versions may require migration of profiles and add-ons may need updating

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
  • Testing1.0 h
  • Review / QA1.0 h
4.0 hours of engineering $750
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Scan for this in your stack

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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-2011-2376 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