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FirefoxWeb browser · Mozilla

CVE-2024-11699

HIGH · 8.8 CVSS v3.1 Published 2024-11-26
Fix available
A fix is available. Upgrade to 128.5 / 128.5.0 or later.
See remediation →
95/100
Remediation priority · Urgent
Remotely reachable No privileges

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
Memory safety bugs present in Firefox 132, Firefox ESR 128.4, and Thunderbird 128.4. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 133, Firefox ESR < 128.5, Thunderbird < 133, and Thunderbird < 128.5.

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 safety bugs in Firefox 132, Firefox ESR 128.4, and Thunderbird 128.4 allowing memory corruption that could potentially be exploited for arbitrary code execution.

MitigationUpgrade to Firefox 133+, Firefox ESR 128.5+, Thunderbird 133+, or Thunderbird 128.5+ to patch the memory safety vulnerabilities.

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:< 128.5.0< 133.0
ThunderbirdApplication
Affected:< 128.5>= 129.0, < 133.0

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
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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 Firefox or Thunderbird installation by looking for the application in common locations: Windows (C:\Program Files\Mozilla Firefox or C:\Program Files\Mozilla Thunderbird), macOS (/Applications/Firefox.app or /Applications/Thunderbird.app), Linux (which firefox or which thunderbird)
    Affected if Product is Firefox or Thunderbird
  2. Determine Firefox version
    In Firefox, navigate to Help > About Firefox, or enter 'about:support' in the address bar, or run 'firefox --version' from command line
    Affected if Firefox version is less than 128.5.0 or less than 133.0 (the specific patch versions are 128.5.0 and 133.0)
  3. Determine Thunderbird version
    In Thunderbird, navigate to Help > About Thunderbird, or run 'thunderbird --version' from command line
    Affected if Thunderbird version is less than 128.5, or between 129.0 and 132.x (less than 133.0)
  4. Compare version to affected ranges
    For Firefox: the affected ranges are any version below 128.5.0 or below 133.0. For Thunderbird: affected if version < 128.5 OR (version >= 129.0 AND version < 133.0). Note that versions 128.5.x are fixed, versions 129.0-132.x are affected until 133.0
    Affected if Installed version falls into any affected range described above

User is affected if Firefox is below version 128.5.0 or below 133.0, or if Thunderbird is below 128.5 or between 129.0 and 132.x (below 133.0)

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 128.5 / 128.5.0 / 133.0 or later
Fixed in 128.5128.5.0133.0
Interim mitigation

Upgrade to Firefox 133+, Firefox ESR 128.5+, Thunderbird 133+, or Thunderbird 128.5+ to patch the memory safety vulnerabilities.

Recommended fix High confidence

Firefox 133.0+ (or Firefox ESR 128.5+); Thunderbird 133.0+ (or Thunderbird 128.5+)

  1. 1. Check the currently installed Firefox version by navigating to Menu > Help > About Firefox (or typing 'about:firefox' in the address bar)
  2. 2. Check the currently installed Thunderbird version by navigating to Menu > Help > About Thunderbird (or typing 'about:thunderbird' in the address bar)
  3. 3. For Firefox: Download and install Firefox 133.0 or later from the official Mozilla website (www.mozilla.org)
  4. 4. For Firefox ESR: Download and install Firefox ESR 128.5 or later from the Mozilla website
  5. 5. For Thunderbird: Download and install Thunderbird 133.0 or later from the Mozilla website
  6. 6. For Thunderbird 128.x line: Download and install Thunderbird 128.5 or later from the Mozilla website
  7. 7. Restart the application after installation
  8. 8. Verify the version has been updated to the fixed release by checking the About dialog again
Caveat Minor: Update includes security fixes and may include minor feature changes; review Mozilla release notes for any behavior changes

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

Fix this in Firefox Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing4.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,540
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,464.

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-2024-11699 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

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