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Actively exploited in the wild. This CVE is on the CISA Known Exploited Vulnerabilities list — treat remediation as urgent. Federal remediation due by 13 Jun 2022.
FirefoxWeb browser · Mozilla

CVE-2019-11708

CRITICAL · 10.0 CVSS v3.1 Published 2019-07-23
Fix available
A fix is available. Upgrade to 60.7.2 / 67.0.4 or later.
See remediation →
100/100
Remediation priority · Urgent
In the wild High EPSS Public exploit 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
Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxed parent process opening web content chosen by a compromised child process. When combined with additional vulnerabilities this could result in executing arbitrary code on the user's computer. This vulnerability affects Firefox ESR < 60.7.2, Firefox < 67.0.4, and Thunderbird < 60.7.2.

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

An IPC (Inter-Process Communication) vulnerability in Mozilla products allows a compromised child process to send a specially crafted 'Prompt:Open' message to the non-sandboxed parent process without proper parameter validation. This enables the child process to cause the parent process to open arbitrary web content, which when combined with other vulnerabilities can lead to arbitrary code execution on the user's machine.

MitigationUpdate affected Mozilla products to the fixed versions: Firefox ESR 60.7.2+, Firefox 67.0.4+, or Thunderbird 60.7.2+. This is a critical priority given the CVSS 10 severity and potential for remote code execution when chained with other flaws.

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:< 60.7.2< 67.0.4
ThunderbirdApplication
Affected:< 60.7.2

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
Changed
Confidentiality
High
Integrity
High
Availability
High

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

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

  1. Check Firefox version on Windows
    Open Firefox, click the menu button (three horizontal lines), select Help, then About Firefox. The version number is displayed in the window that opens.
    Affected if Version displayed is less than 67.0.4 (or between 60.7.2 and 67.0.4 for non-ESR releases)
  2. Check Firefox version on macOS
    Open Firefox, click the Firefox menu in the menu bar, then select About Firefox. The version number is displayed in the window that opens.
    Affected if Version displayed is less than 67.0.4 (or between 60.7.2 and 67.0.4 for non-ESR releases)
  3. Check Firefox version on Linux
    Run the command 'firefox --version' in a terminal, or open Firefox and navigate to 'about:support' in the address bar to see the version under Application Basics.
    Affected if Version displayed is less than 67.0.4 (or between 60.7.2 and 67.0.4 for non-ESR releases)
  4. Check Thunderbird version
    Open Thunderbird, click the menu button (three horizontal lines), select Help, then About Thunderbird. The version number is displayed in the window that opens.
    Affected if Version displayed is less than 60.7.2

You are affected if Firefox is below version 67.0.4 (or below 60.7.2 for ESR) or if Thunderbird is below version 60.7.2.

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 60.7.2 / 67.0.4 or later
Fixed in 60.7.267.0.4
Interim mitigation

Update affected Mozilla products to the fixed versions: Firefox ESR 60.7.2+, Firefox 67.0.4+, or Thunderbird 60.7.2+. This is a critical priority given the CVSS 10 severity and potential for remote code execution when chained with other flaws.

Recommended fix High confidence

Firefox 67.0.4 or later; Firefox ESR 60.7.2 or later; Thunderbird 60.7.2 or later

  1. Open Firefox or Thunderbird
  2. Navigate to Help > About Firefox/Thunderbird
  3. Click 'Check for Updates' or allow automatic update check
  4. If an update is available, click 'Update' or wait for download to complete
  5. Restart the browser/application after update completes
  6. Verify version by going to Help > About - should show 67.0.4+ or 60.7.2+ depending on release channel

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Firefox Exploited in the wild — priority engagement
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,600
Get it fixed fast

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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-2019-11708 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