FirefoxWeb browser · Mozilla
CVE-2022-31748
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 · uneditedMozilla developers Gabriele Svelto, Timothy Nikkel, Randell Jesup, Jon Coppeard, and the Mozilla Fuzzing Team reported memory safety bugs present in Firefox 100. 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 < 101.
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 confidenceMemory safety bugs in Firefox 100 leading to memory corruption that could potentially be exploited to run arbitrary code. These vulnerabilities were identified through fuzzing and affected multiple Mozilla developers.
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
< 101CVSS 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 checksWork through these to decide whether this CVE applies to you.
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Check Firefox version via About dialogOpen Firefox, click the menu button (three horizontal lines), select Help, then select About Firefox. The version number will be displayed in the window that opens.Affected if The displayed version number is less than 101 (for example, 100.0, 100.0.1, etc.)
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Check Firefox version via command lineOpen a terminal or command prompt and run 'firefox --version' or 'firefox -v' to display the installed Firefox version.Affected if The version output shows a number less than 101.
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Check Firefox version on Windows via Programs and FeaturesOpen Control Panel, go to Programs and Features, locate Mozilla Firefox in the list, and observe the version column.Affected if The listed version is below 101.
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Check Firefox executable file properties on WindowsNavigate to the Firefox installation directory (typically C:\Program Files\Mozilla Firefox), right-click firefox.exe, select Properties, and view the Details tab for the version information.Affected if The file version shown is less than 101.x.x.x.
You are affected if the installed Mozilla Firefox version is any version below 101.
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 · scoped101
Upgrade Firefox to version 101 or later to apply the security patch addressing these memory safety vulnerabilities.
Firefox 101 or later (recommended: latest available version)
- 1. Open Firefox and navigate to Menu > Help > About Firefox to check the current version
- 2. If the version is below 101, update Firefox by clicking 'Update' in the About dialog or downloading the latest version from www.mozilla.org
- 3. Restart Firefox after the update completes
- 4. Verify the update was successful by checking Help > About Firefox shows version 101 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
- Implementation0.5 h
- Testing1.0 h
- Review / QA0.5 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-2022-31748 — 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-2022-31748 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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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.
- 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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