FirefoxWeb browser · Mozilla
CVE-2024-9936
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 · uneditedWhen manipulating the selection node cache, an attacker may have been able to cause unexpected behavior, potentially leading to an exploitable crash. This vulnerability affects Firefox < 131.0.3.
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 confidenceA memory safety vulnerability exists in Firefox's selection node cache manipulation. An attacker can manipulate the selection node cache to cause unexpected behavior, potentially leading to an exploitable crash. This is a client-side memory corruption issue affecting Firefox versions prior to 131.0.3.
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
< 131.0.3CVSS 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
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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 checksWork through these to decide whether this CVE applies to you.
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Verify Firefox is installedCheck for Firefox installation by looking for the executable: On Windows, check Program Files/Mozilla Firefox or AppData; on macOS, check /Applications/Firefox.app; on Linux, run 'which firefox' or check /usr/lib/firefoxAffected if Firefox is installed on the system
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Determine installed Firefox versionOpen Firefox, click the menu (three lines), go to Help > About Firefox. The version number displays on this page. Alternatively, visit 'about:support' in the address bar or run 'firefox --version' from command lineAffected if Version shown is below 131.0.3
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Compare against affected rangeCompare the discovered version number to the affected range: any version prior to 131.0.3 (including 131.0.2, 131.0.1, 131.0, 130.x, 129.x, and earlier) is vulnerableAffected if Installed version is less than 131.0.3
If Firefox is installed and the version is below 131.0.3, the environment is affected by this vulnerability.
Generated from the published advisory. Verify against your own configuration.
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 · scoped131.0.3
Update Firefox to version 131.0.3 or later to remediate this vulnerability. No configuration changes are required; simply upgrading the browser addresses the issue.
Firefox 131.0.3
- Open Firefox browser
- Click the menu button (three horizontal lines) in the top-right corner
- Select 'Help' from the dropdown menu
- Click 'About Firefox'
- The About Firefox window will check for updates automatically
- If version 131.0.3 or later is available, click 'Restart to update Firefox'
- After Firefox restarts, verify the version by going to Help > About Firefox and confirming the version number is 131.0.3 or higher
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
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
Free · runs locallyCheck whether your project pulls in CVE-2024-9936 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2024-9936 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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
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