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CVE-2019-11708

10, critical Known exploited

Mozilla Firefox and Thunderbird Sandbox Escape Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
10, critical critical CVSS v3.1
EPSS, next 30 days
56% higher than 99% of scored CVEs
Exploitation
Confirmed in the wild
Published
23 Jul 20197 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 23 May 2022. US federal agencies had to remediate by 13 Jun 2022, a deadline that has passed.

Required action. Apply updates per vendor instructions.

Description

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.

Details

Vendor
Mozilla
Product
Firefox ESR
Weakness
CWE-20 (opens in a new tab)
Status
Analyzed
Updated
17 Jun 2026
Assigner
security@mozilla.org

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References 6

Exploit code 1

Advisories 4

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Mozilla CVEs

Every Mozilla CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2024-9680 Mozilla Firefox Use-After-Free Vulnerability KEV EPSS 23% 9.8, critical
  • CVE-2022-26485 Mozilla Firefox Use-After-Free Vulnerability KEV EPSS 14% 8.8, high
  • CVE-2022-26486 Mozilla Firefox Use-After-Free Vulnerability KEV EPSS 2% 9.6, critical
  • CVE-2020-6819 Mozilla Firefox And Thunderbird Use-After-Free Vulnerability KEV EPSS 3% 8.1, high
  • CVE-2020-6820 Mozilla Firefox And Thunderbird Use-After-Free Vulnerability KEV EPSS 7% 8.1, high
  • CVE-2019-17026 Mozilla Firefox And Thunderbird Type Confusion Vulnerability KEV EPSS 46% 8.8, high
  • CVE-2019-11707 Mozilla Firefox and Thunderbird Type Confusion Vulnerability KEV EPSS 38% 8.8, high
  • CVE-2016-9079 Mozilla Firefox, Firefox ESR, and Thunderbird Use-After-Free Vulnerability KEV EPSS 88% 7.5, high

Beyond this page

Is CVE-2019-11708 in your network?

This page tells you how dangerous CVE-2019-11708 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2019-11708 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.