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CRITICAL · CVSS 10 CISA Known Exploited Vulnerability

CVE-2019-11708

Mozilla Firefox and Thunderbird Sandbox Escape Vulnerability

Mozilla Firefox and Thunderbird

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.

CVSS
10
CRITICAL
EPSS
55.9%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
23 Jul 2019
CWE-20

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 23 May 2022. US federal agencies were required to remediate it by 13 June 2022.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 55.9%, which is higher than 99% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.

CVSS vector

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

Frequently asked questions

Is CVE-2019-11708 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2019-11708.

What does CVE-2019-11708 affect?

CVE-2019-11708 affects Mozilla Firefox and Thunderbird. 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.

How severe is CVE-2019-11708?

CVE-2019-11708 is rated CRITICAL with a CVSS base score of 10. EPSS puts the probability of exploitation in the next 30 days at 55.9%, higher than 99% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 13 June 2022.

How should organisations respond to CVE-2019-11708?

Apply the vendor patch for Mozilla Firefox and Thunderbird as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.