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Actively exploited in the wild. This CVE is on the CISA Known Exploited Vulnerabilities list — treat remediation as urgent. Federal remediation due by 5 Nov 2024. Known ransomware use
FirefoxWeb browser · Mozilla

CVE-2024-9680

CRITICAL · 9.8 CVSS v3.1 Published 2024-10-09
Fix available
A fix is available. Upgrade to 115.16.0 / 115.16.1 or later.
See remediation →
100/100
Remediation priority · Urgent
In the wild Ransomware 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
An attacker was able to achieve code execution in the content process by exploiting a use-after-free in Animation timelines. We have had reports of this vulnerability being exploited in the wild. This vulnerability affects Firefox < 131.0.2, Firefox ESR < 128.3.1, Firefox ESR < 115.16.1, Thunderbird < 131.0.1, Thunderbird < 128.3.1, and Thunderbird < 115.16.0.

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

A use-after-free vulnerability in the Animation timelines component allows attackers to achieve arbitrary code execution in the Firefox/Thunderbird content process. This memory corruption flaw has been observed being actively exploited in the wild.

MitigationImmediately update affected installations to Firefox 131.0.2, Firefox ESR 128.3.1/115.16.1, or Thunderbird 131.0.1/128.3.1/115.16.0 or later to remediate this critical vulnerability.

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:< 115.16.1< 131.0.2>= 128.1.0, < 128.3.1
Debian LinuxOperating system
Affected:= 11.0
ThunderbirdApplication
Affected:< 115.16.0>= 128.0.1, < 128.3.1= 131.0

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
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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. Check Firefox browser version
    Run 'firefox --version' from command line, or on Windows check Help > About Firefox, or on macOS from Firefox menu > About Firefox
    Affected if version is below 115.16.1, or below 131.0.2, or between 128.1.0 and 128.3.0 inclusive
  2. Check Thunderbird email client version
    Run 'thunderbird --version' from command line, or check Help > About Thunderbird
    Affected if version is below 115.16.0, or between 128.0.1 and 128.3.0 inclusive, or exactly 131.0
  3. Check installed package version on Debian Linux
    Run 'dpkg -l | grep -i firefox' or 'apt-cache policy firefox' to see the installed package version
    Affected if firefox package version indicates an affected release (versions below 115.16.1, 128.x before 128.3.1, or 131.x before 131.0.2)

You are affected if any installed Firefox or Thunderbird version falls within the vulnerable ranges: Firefox < 115.16.1, < 131.0.2, or 128.1.0-128.3.0; Thunderbird < 115.16.0, 128.0.1-128.3.0, or exactly 131.0

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 115.16.0 / 115.16.1 / 128.3.1 or later
Fixed in 115.16.0115.16.1128.3.1
Vendor patch msrc.microsoft.com →
Interim mitigation

Immediately update affected installations to Firefox 131.0.2, Firefox ESR 128.3.1/115.16.1, or Thunderbird 131.0.1/128.3.1/115.16.0 or later to remediate this critical vulnerability.

Recommended fix High confidence

Firefox 131.0.2+, Firefox ESR 128.3.1+, Firefox ESR 115.16.1+, Thunderbird 128.3.1+, Thunderbird 115.16.0+, Thunderbird 131.0.2+

  1. Check current Firefox version: Navigate to Menu > Help > About Firefox (or enter 'about:firefox' in address bar)
  2. Check current Thunderbird version: Navigate to Menu > Help > About Thunderbird
  3. For Firefox: Upgrade to version 131.0.2 or later for mainstream, 128.3.1 or later for ESR 128.x, or 115.16.1 or later for ESR 115.x
  4. For Thunderbird: Upgrade to version 128.3.1 or later for ESR 128.x, or 115.16.0 or later for ESR 115.x, or 131.0.2 for mainstream
  5. On Linux: Run 'sudo apt-get update && sudo apt-get upgrade' for Debian-based distributions, or use your system's package manager
  6. On Windows/macOS: Use automatic updates or download from https://www.mozilla.org/
  7. Verify the update was successful by checking the About page again
Caveat Standard browser update with minimal risk; ensure any local extensions are compatible with new version

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

Fix this in Firefox Exploited in the wild — priority engagement
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,040
Get it fixed fast

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,664.

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-2024-9680 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