FirefoxWeb browser · Mozilla
CVE-2019-11692
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 · uneditedA use-after-free vulnerability can occur when listeners are removed from the event listener manager while still in use, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7.
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 confidenceA use-after-free vulnerability exists in the event listener manager where listeners are removed while still in active use, causing the program to access freed memory and potentially enabling arbitrary code execution.
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
< 60.7.0< 67.0< 60.7.0CVSS 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
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/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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Identify installed Mozilla productsCheck for Firefox or Thunderbird executables in standard installation paths (e.g., C:\Program Files\Mozilla Firefox\firefox.exe or C:\Program Files\Mozilla Thunderbird\thunderbird.exe on Windows; /Applications/Firefox.app on macOS; /usr/lib/firefox/ on Linux)Affected if Firefox or Thunderbird is installed on the system
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Check Firefox versionOpen Firefox, go to Help > About Firefox, or enter 'about:support' in the address bar to view the version numberAffected if Firefox version is below 60.7.0 or below 67.0 (any version below 67.0 is affected)
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Check Thunderbird versionOpen Thunderbird, go to Help > About Thunderbird to view the version numberAffected if Thunderbird version is below 60.7.0
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Verify event listener usageThis vulnerability requires active use of event listeners in web content or email message processing. The flaw exists in the browser engine's event listener manager, not in a configurable feature.Affected if The vulnerable version is running and processing web content or email with interactive elements
The user is affected if Mozilla Firefox below 67.0 (or below 60.7.0 for older release branches) or Mozilla Thunderbird below 60.7.0 is installed and in active use.
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 · scoped60.7.067.0
Upgrade Thunderbird to 60.7+, Firefox to 67+, or Firefox ESR to 60.7+ to patch the vulnerable event listener manager code.
Firefox 67.0 (or later), Firefox ESR 60.7.0 (or later), Thunderbird 60.7.0 (or later)
- Check current Firefox or Thunderbird version (Help > About Firefox/Thunderbird)
- For Firefox: Download and install Firefox 67.0 or later from mozilla.org
- For Firefox ESR: Download and install Firefox ESR 60.7.0 or later from mozilla.org
- For Thunderbird: Download and install Thunderbird 60.7.0 or later from mozilla.org
- Restart the application after upgrade
- Verify the version reflects the fixed release
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Firefox
Scoped from the published advisory
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-11692 — 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-2019-11692 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
- No spam, self-promotion, credentials, or personal data