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FirefoxWeb browser · Mozilla

CVE-2023-32214

HIGH · 7.5 CVSS v3.1 Published 2023-06-19
Fix available
A fix is available. Upgrade to 102.11 / 113.0 or later.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

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
Protocol handlers `ms-cxh` and `ms-cxh-full` could have been leveraged to trigger a denial of service. *Note: This attack only affects Windows. Other operating systems are not affected.* 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 confidence

The ms-cxh and ms-cxh-full protocol handlers in Firefox, Firefox ESR, and Thunderbird for Windows can be triggered to cause a denial of service condition. This appears to be a local DoS vulnerability where the protocol handlers can be invoked (likely through a crafted URI or web page) to cause the application to become unresponsive or crash.

MitigationUpdate affected Windows installations to Firefox 113 or later, Firefox ESR 102.11 or later, or Thunderbird 102.11 or later. No other mitigation is required beyond applying the vendor patch.

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:< 113.0
Firefox EsrWeb browser
Affected:< 102.11
ThunderbirdApplication
Affected:< 102.11

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
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 checks

Work through these to decide whether this CVE applies to you.

  1. Verify Windows operating system
    Check if the system is running Windows (this vulnerability only affects Windows installations). Open Command Prompt and run: systeminfo | findstr /B /C:"OS Name"
    Affected if The system is NOT running Windows - the vulnerability only affects Windows versions of Firefox, Firefox ESR, and Thunderbird
  2. Check Firefox version
    If Firefox is installed, open Firefox, go to Help > About Firefox, or navigate to about:support. Alternatively, check the program files directory for the version. Compare the displayed version number against 113.0
    Affected if The installed Firefox version is lower than 113.0 on Windows
  3. Check Firefox ESR version
    If Firefox ESR is installed, open the application, go to Help > About Firefox ESR, or navigate to about:support. Compare the displayed version number against 102.11
    Affected if The installed Firefox ESR version is lower than 102.11 on Windows
  4. Check Thunderbird version
    If Thunderbird is installed, open the application, go to Help > About Thunderbird. Compare the displayed version number against 102.11
    Affected if The installed Thunderbird version is lower than 102.11 on Windows

A user is affected if they are running Firefox below 113.0, Firefox ESR below 102.11, or Thunderbird below 102.11 on a Windows system, as these versions contain the vulnerable ms-cxh and ms-cxh-full protocol handlers.

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 102.11 / 113.0 or later
Fixed in 102.11113.0
Interim mitigation

Update affected Windows installations to Firefox 113 or later, Firefox ESR 102.11 or later, or Thunderbird 102.11 or later. No other mitigation is required beyond applying the vendor patch.

Recommended fix High confidence

Firefox 113.0, Firefox ESR 102.11, or Thunderbird 102.11 (or later)

  1. Verify current version by opening Firefox/Thunderbird and navigating to Help > About (or checking application settings)
  2. Update to the fixed version: Firefox 113.0 or later, Firefox ESR 102.11 or later, or Thunderbird 102.11 or later
  3. For enterprise/deployment environments, use the appropriate software distribution channel (e.g., Windows Update, enterprise patch management, or download from mozilla.org
  4. Restart the application after update to ensure the fix is applied
  5. Verify the updated version by checking Help > About to confirm the installed version matches or exceeds the fixed release

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
5.0 hours of engineering $890
Get the upgrade done

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

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dbcve dependency scanner

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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-2023-32214 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