FirefoxWeb browser · Mozilla
CVE-2023-32213
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 reading a file, an uninitialized value could have been used as read limit. This vulnerability affects Firefox < 113, Firefox ESR < 102.11, and Thunderbird < 102.11.
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 file reading vulnerability in Firefox, Firefox ESR, and Thunderbird allows an uninitialized memory value to be used as the read limit, potentially causing an out-of-bounds read that could expose sensitive data from memory.
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
< 113.0
Firefox EsrWeb browser
< 102.11< 102.11CVSS 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 checksWork through these to decide whether this CVE applies to you.
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Check Firefox versionRun 'firefox --version' in terminal, or on Windows check Help > About Firefox, or query the registry key HKLM\SOFTWARE\Mozilla\Mozilla Firefox\CurrentVersionAffected if Version is less than 113.0
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Check Firefox ESR versionRun 'firefox --version' in terminal, or on Windows check Help > About Firefox, or query the registry key HKLM\SOFTWARE\Mozilla\Mozilla Firefox\CurrentVersion (ESR versions contain 'ESR' in the displayed version string)Affected if Version is less than 102.11 (ESR branch)
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Check Thunderbird versionRun 'thunderbird --version' in terminal, or on Windows check Help > About Thunderbird, or query the registry key HKLM\SOFTWARE\Mozilla\Mozilla Thunderbird\CurrentVersionAffected if Version is less than 102.11
If any installed Firefox, Firefox ESR, or Thunderbird version falls below 113.0, 102.11, or 102.11 respectively, the uninitialized memory read vulnerability is present in that product.
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 · scoped102.11113.0
Upgrade to Firefox 113+, Firefox ESR 102.11+, or Thunderbird 102.11+ to patch this vulnerability.
Firefox 113.0, Firefox ESR 102.11, or Thunderbird 102.11
- For Firefox: Open Firefox, go to Menu > Help > About Firefox. The browser will check for updates and prompt you to update to version 113.0 or later.
- For Firefox ESR: Update via your organization's patch management system, or download Firefox ESR 102.11 or later from www.mozilla.org/firefox/releases/
- For Thunderbird: Open Thunderbird, go to Menu > Help > About Thunderbird. The application will check for updates and prompt you to update to version 102.11 or later.
- Alternatively, for all products: Download the latest version from www.mozilla.org and reinstall to ensure you have the fixed release.
- Verify the installed version by checking About after updating to confirm you have version 113.0 (Firefox) or 102.11 (Firefox ESR/Thunderbird) 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
- Implementation2.0 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 $1,424.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-32213 — 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-2023-32213 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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