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FirefoxWeb browser · Mozilla

CVE-2019-11699

MEDIUM · 6.5 CVSS v3.0 Published 2019-07-23
Fix available
A fix is available. Upgrade to 67.0 or later.
See remediation →
72/100
Remediation priority · Elevated
Remotely reachable No privileges

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
A malicious page can briefly cause the wrong name to be highlighted as the domain name in the addressbar during page navigations. This could result in user confusion of which site is currently loaded for spoofing attacks. This vulnerability affects Firefox < 67.

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 confidence

A race condition in Firefox's address bar causes the wrong domain name to be highlighted during page navigations, allowing malicious pages to briefly display an incorrect domain to users. This UI redress vulnerability enables spoofing attacks by misleading users about which site they're visiting.

MitigationUpgrade Firefox to version 67 or later to patch the address bar highlighting vulnerability.

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:< 67.0

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
Required
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.0/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 checks

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

  1. Locate Firefox installation
    Find the Firefox executable or check system installed programs. On Windows: check Program Files/Mozilla Firefox or %APPDATA%/Mozilla/Firefox. On macOS: check /Applications/Firefox.app. On Linux: run 'which firefox' or check /usr/lib/firefox.
    Affected if Firefox is installed on the system
  2. Determine installed Firefox version
    Open Firefox, click the menu button (three horizontal lines), select Help, then About Firefox. The version number displays on this page. Alternatively, run 'firefox --version' from command line on Linux/macOS, or check the application properties in Windows.
    Affected if The version shown is below 67.0 (e.g., 66.0.x, 65.x, etc.)
  3. Confirm address bar behavior is relevant
    This vulnerability affects the address bar highlighting during page navigation. No specific configuration toggle exists - the race condition is present in the browser's core UI code for all users of affected versions.
    Affected if Firefox version is 66.x or earlier and the address bar is used for navigation

If the installed Firefox version is any release before 67.0, the environment is affected by this address bar highlighting race condition.

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.

From vendor data
Upgrade available Upgrade to 67.0 or later
Fixed in 67.0
Interim mitigation

Upgrade Firefox to version 67 or later to patch the address bar highlighting vulnerability.

Fix this in Firefox Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA2.0 h
10.0 hours of engineering $1,780
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,848.

Scan for this in your stack

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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-2019-11699 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