FirefoxWeb browser · Mozilla
CVE-2022-38475
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 · uneditedAn attacker could have written a value to the first element in a zero-length JavaScript array. Although the array was zero-length, the value was not written to an invalid memory address. This vulnerability affects Firefox < 104.
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 confidenceFirefox before version 104 contains a flaw in its JavaScript engine (SpiderMonkey) where a value could be written to the first element of a zero-length JavaScript array. While the description indicates this did not result in an invalid memory address write, it represents improper bounds checking in array element access that could potentially be leveraged in more sophisticated exploitation scenarios.
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
< 104.0CVSS 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
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
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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Check Firefox version via browser UIOpen a new tab and navigate to about:support or click the menu button (three lines) > Help > About Firefox. The version number is displayed at the top.Affected if The displayed version is less than 104.0 (for example, 103.0, 103.0.1, 102.x, etc.)
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Check Firefox version via command lineRun 'firefox --version' in a terminal or command prompt, or check the executable properties of the firefox.exe file.Affected if The reported version is less than 104.0
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Verify installation source and patch statusCheck if Firefox was installed via an automated update mechanism, package manager, or manual download. On Windows, check Windows Update status for Firefox updates.Affected if Updates are not configured or the last update pushed a version prior to 104.0
A user is affected if their installed Firefox version is any release prior to 104.0, regardless of operating system or configuration.
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 · scoped104.0
Update Firefox to version 104 or later. Organizations should ensure all installations are patched through their patch management processes.
Firefox 104.0
- Upgrade Firefox to version 104.0 or later to remediate this vulnerability
- Verify the upgrade was successful by checking Help > About Firefox to confirm the version number
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
- Testing1.0 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 $1,200.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2022-38475 — 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-2022-38475 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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