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FirefoxWeb browser · Mozilla

CVE-2011-2982

HIGH · 10.0 CVSS v2.0 Published 2011-08-18
Fix available
A fix is available. Upgrade to after 3.6.19 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 3.6.20, Thunderbird 2.x and 3.x before 3.1.12, SeaMonkey 1.x and 2.x, and possibly other products 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 · moderate confidence

Multiple memory corruption vulnerabilities in the Mozilla Gecko rendering engine allowed remote attackers to crash affected applications (denial of service) or potentially achieve arbitrary code execution via unknown vectors. The vulnerabilities affected Firefox prior to 3.6.20, Thunderbird 2.x/3.x prior to 3.1.12, and SeaMonkey 1.x/2.x.

MitigationApply vendor-supplied patches by updating to Firefox 3.6.20+, Thunderbird 3.1.12+, or SeaMonkey 2.x+ as appropriate for the affected product.

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:<= 3.6.19= 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:= 3.0= 3.0.1= 3.0.2= 3.0.3= 3.0.4= 3.0.5= 3.0.6= 3.0.7= 3.0.8= 3.0.9= 3.0.10= 3.0.11
SeamonkeyApplication
Affected:= 2.0= 2.0.1= 2.0.2= 2.0.3= 2.0.4= 2.0.5= 2.0.6= 2.0.7= 2.0.8= 2.0.9= 2.0.10= 2.0.11

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 for the presence of Firefox, Thunderbird, or SeaMonkey on the system. On Windows, look in Program Files for Mozilla Firefox, Mozilla Thunderbird, or SeaMonkey folders. On Linux, check /usr/bin for firefox, thunderbird, or seamonkey commands.
    Affected if Any of these three products are installed and the version falls within the affected ranges
  2. Determine Firefox version
    Open Firefox, click Help > About Firefox, or run 'firefox --version' from command line. The version number displayed is the installed version.
    Affected if Version is 3.6.19 or lower, or one of the specific 1.x versions listed (1.0 through 1.5.0.1)
  3. Determine Thunderbird version
    Open Thunderbird, click Help > About Thunderbird, or run 'thunderbird --version' from command line. The version number displayed is the installed version.
    Affected if Version is one of the specific 3.0.x versions listed (3.0 through 3.0.11)
  4. Determine SeaMonkey version
    Open SeaMonkey, click Help > About SeaMonkey, or run 'seamonkey --version' from command line. The version number displayed is the installed version.
    Affected if Version is one of the specific 2.0.x versions listed (2.0 through 2.0.11)

The system is affected if any installed Mozilla product (Firefox, Thunderbird, or SeaMonkey) matches a version explicitly listed in the affected versions for that product.

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 3.6.19
Interim mitigation

Apply vendor-supplied patches by updating to Firefox 3.6.20+, Thunderbird 3.1.12+, or SeaMonkey 2.x+ as appropriate for the affected product.

Recommended fix High confidence

Firefox 3.6.20+, Thunderbird 3.1.12+, or SeaMonkey 2.x latest (matching the fix branch)

  1. 1. Identify the currently installed Mozilla product (Firefox, Thunderbird, or SeaMonkey) and its exact version
  2. 2. If using Firefox 3.6.x, upgrade to Firefox 3.6.20 or later
  3. 3. If using Thunderbird 2.x or 3.x, upgrade to Thunderbird 3.1.12 or later
  4. 4. If using SeaMonkey 1.x or 2.x, upgrade to the latest available SeaMonkey 2.x release that includes the security fix
  5. 5. Verify the upgrade was successful by checking the updated version number in the application's About dialog
  6. 6. Restart the application to ensure all components are updated
Caveat Some older extensions or plugins may be incompatible with the newer minor version; test critical workflows before deploying widely

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

Fix this in Firefox Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,600
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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-2011-2982 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