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FirefoxWeb browser · Mozilla

CVE-2014-1548

HIGH · 10.0 CVSS v2.0 Published 2014-07-23
Fix available
A fix is available. Upgrade to after 30.0 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 31.0 and Thunderbird before 31.0 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

Memory corruption vulnerabilities in the Mozilla Gecko browser engine affecting Firefox and Thunderbird prior to version 31.0. Remote attackers can trigger memory corruption leading to application crashes or potentially achieve arbitrary code execution through unspecified vectors.

MitigationUpdate Mozilla Firefox to version 31.0 or later, and Thunderbird to version 31.0 or later, to obtain the patched browser engine.

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:<= 30.0
ThunderbirdApplication
Affected:<= 24.7= 24.0= 24.0.1= 24.1= 24.1.1= 24.2= 24.3= 24.4= 24.5= 24.6

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 which Mozilla product is installed
    Check for Firefox or Thunderbird installation. On Windows, look in Program Files. On Linux, run 'which firefox' or 'which thunderbird'. On macOS, check /Applications for Firefox or Thunderbird.
    Affected if Either Firefox or Thunderbird is installed on the system
  2. Determine Firefox version
    Run 'firefox --version' from command line, or open Firefox and navigate to Help > About Firefox. Note the exact version number displayed.
    Affected if The installed version is 30.0 or lower (any version <= 30.0)
  3. Determine Thunderbird version
    Run 'thunderbird --version' from command line, or open Thunderbird and navigate to Help > About Thunderbird. Note the exact version number displayed.
    Affected if The installed version is 24.0, 24.0.1, 24.1, 24.1.1, 24.2, 24.3, 24.4, 24.5, 24.6, or 24.7
  4. Confirm Gecko engine version (optional)
    In Firefox, type 'about:config' in the address bar and search for 'app.buildID' or 'platform version' to view the underlying Gecko engine version. For Thunderbird, the same 'about:config' method applies.
    Affected if The Gecko engine version corresponds to an unpatched Firefox <= 30.0 or Thunderbird 24.x release

A system is affected if Firefox version 30.0 or lower, or Thunderbird version 24.0 through 24.7, is installed and running.

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 30.0
Interim mitigation

Update Mozilla Firefox to version 31.0 or later, and Thunderbird to version 31.0 or later, to obtain the patched browser engine.

Recommended fix High confidence

Firefox 31.0 and Thunderbird 31.0

  1. 1. Backup your bookmarks, passwords, and important browser data before upgrading
  2. 2. Download Firefox 31.0 from the official Mozilla website (mozilla.org)
  3. 3. Download Thunderbird 31.0 from the official Mozilla website if affected
  4. 4. Close all instances of Firefox or Thunderbird
  5. 5. Install the new version by running the downloaded installer
  6. 6. After installation, verify the version by checking Help > About Firefox or Help > About Thunderbird
  7. 7. Ensure the version shows 31.0 or higher
  8. 8. Re-enable any necessary extensions or add-ons after confirming the upgrade
Caveat Some older extensions or add-ons may be incompatible with version 31.0; review add-on compatibility before upgrading

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 upgrade done

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

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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-2014-1548 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